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--- back2root:ibm-pc-ms-dos:interrupts:old:ms_interrupt_list-22-30 [2023/01/05 04:01] – supprimée - modification externe (Unknown date) 127.0.0.1
+++ back2root:ibm-pc-ms-dos:interrupts:old:ms_interrupt_list-22-30 [2023/01/05 04:01] (Version actuelle) – créée - modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+====== MSDOS - Interrupt List 22h-30h ======
+----------22---------------------------------
+INT 22 - DOS 1+ - PROGRAM TERMINATION ADDRESS
+   specifies the address of the routine which is to be given control after
+   a program is terminated; should never be called directly, since it does not
+   point at an interrupt handler
+Notes:	this vector is restored from the DWORD at offset 0Ah in the PSP during
+	  termination, and then a FAR JMP is performed to the address in INT 22
+	normally points at the instruction immediately following INT 21/AH=4Bh
+	  call which loaded the current program
+SeeAlso: INT 20,INT 21/AH=00h,INT 21/AH=31h,INT 21/AH=4Ch
+----------23---------------------------------
+INT 23 - DOS 1+ - CONTROL-C/CONTROL-BREAK HANDLER
+   invoked whenever DOS detects a ^C or ^Break; should never be called directly
+---DOS 1.x---
+Return: AH = 00h abort program
+	if all registers preserved, restart DOS call
+---DOS 2+---
+Return: all registers preserved
+	return via RETF or RETF 2 with CF set
+	    DOS will abort program with errorlevel 0
+	else (RETF/RETF 2 with CF clear or IRET)
+	    interrupted DOS call is restarted
+Notes:	MSDOS 1.25 also invokes INT 23 on a divide overflow (INT 00)
+	any DOS call may safely be made within the INT 23 handler, although
+	  the handler must to check for a recursive invocation if it does
+	  call DOS
+SeeAlso: INT 1B
+----------24---------------------------------
+INT 24 - DOS 1+ - CRITICAL ERROR HANDLER
+   invoked when a critical (usually hardware) error is encountered; should
+   never be called directly
+Critical error handler is invoked with:
+	AH = type and processing flags
+	    bit 7 clear = disk I/O error
+		  set	= -- if block device, bad FAT image in memory
+			  -- if char device, error code in DI
+	    bit 6  unused
+	    bit 5 = 1 if Ignore allowed, 0 if not (DOS 3+)
+	    bit 4 = 1 if Retry allowed, 0 if not (DOS 3+)
+	    bit 3 = 1 if Fail allowed, 0 if not (DOS 3+)
+	    bit 2 \ disk area of error	00 = DOS area  01 = FAT
+	    bit 1 /			10 = root dir  11 = data area
+	    bit 0 = 1 if write, 0 if read
+	AL = drive number if AH bit 7 clear
+	BP:SI -> device driver header (BP:[SI+4] bit 15 set if char device)
+	DI low byte contains error code if AH bit 7 set
+h write-protection violation attempted
+h unknown unit for driver
+h drive not ready
+h unknown command given to driver
+h data error (bad CRC)
+h bad device driver request structure length
+h seek error
+h unknown media type
+h sector not found
+h printer out of paper
+Ah write fault
+Bh read fault
+Ch general failure
+Dh (DOS 3+) sharing violation
+Eh (DOS 3+) lock violation
+Fh invalid disk change
+h (DOS 3+) FCB unavailable
+h (DOS 3+) sharing buffer overflow
+h (DOS 4+) code page mismatch
+h (DOS 4+) out of input
+h (DOS 4+) insufficient disk space
+	STACK:	DWORD	return address for INT 24 call
+		WORD	flags pushed by INT 24
+		WORD	original AX on entry to INT 21
+		WORD	BX
+		WORD	CX
+		WORD	DX
+		WORD	SI
+		WORD	DI
+		WORD	BP
+		WORD	DS
+		WORD	ES
+		DWORD	return address for INT 21 call
+		WORD	flags pushed by INT 21
+Handler must return:
+	AL = action code
+h ignore error and continue processing request
+h retry operation
+h terminate program through the equivalent of INT 21/AH=4Ch
+			(INT 20h for DOS 1.x)
+h fail system call in progress
+	SS,SP,DS,ES,BX,CX,DX preserved
+Notes:	the only DOS calls the handler may make are INT 21/AH=01h-0Ch,30h,59h
+	if the handler returns to the application by popping the stack, DOS
+	  will be in an unstable state until the first call with AH > 0Ch
+	for DOS 3.1+, IGNORE (AL=00h) is turned into FAIL (AL=03h) on network
+	  critical errors
+	if IGNORE specified but not allowed, it is turned into FAIL
+	if RETRY specified but not allowed, it is turned into FAIL
+	if FAIL specified but not allowed, it is turned into ABORT
+	(DOS 3+) if a critical error occurs inside the critical error handler,
+	  the DOS call is automatically failed
+----------25---------------------------------
+INT 25 - DOS 1+ - ABSOLUTE DISK READ (except partitions > 32M)
+	AL = drive number (00h = A:, 01h = B:, etc)
+	CX = number of sectors to read
+	DX = starting logical sector number (0000h - highest sector on drive)
+	DS:BX -> buffer for data
+Return: CF clear if successful
+	CF set on error
+	    AH = status
+h device failed to respond (timeout)
+h seek operation failed
+h controller failed
+h data error (bad CRC)
+h DMA failure
+h requested sector not found
+h write-protected disk (INT 26 only)
+h bad address mark
+h bad command
+	    AL = error code (same as passed to INT 24 in DI)
+	may destroy all other registers except segment registers
+Notes:	original flags are left on stack, and must be popped by caller
+	this call bypasses the DOS filesystem
+BUG:	DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
+	invalid drive number
+SeeAlso: INT 13/AH=02h,INT 26
+----------25---------------------------------
+INT 25 - DOS 3.31+ - ABSOLUTE DISK READ (>32M hard-disk partition)
+	AL = drive number (0=A, 1=B, etc)
+	CX = FFFFh
+	DS:BX -> disk read packet (see below)
+Return: same as above
+Notes:	partition is potentially >32M (and requires this form of the call) if
+	  bit 1 of device attribute word in device driver is set
+	original flags are left on stack, and must be removed by caller
+	this call bypasses the DOS filesystem
+SeeAlso: INT 13/AH=02h,INT 26
+Format of disk read packet:
+Offset	Size	Description
+h	DWORD	sector number
+h	WORD	number of sectors to read
+h	DWORD	transfer address
+----------25CDCD-----------------------------
+INT 25 - Stacker - GET DEVICE DRIVER ADDRESS
+	AX = CDCDh
+	DS:BX -> buffer for address (see below)
+	CX = 0001h
+	DX = 0000h
+Return: AX = CDCDh if Stacker installed
+	    DS:BX buffer filled
+Format of driver address buffer:
+Offset	Size	Description
+h	WORD	signature CDCDh
+h	WORD	??? 0001h
+h	DWORD	pointer to start of Stacker device driver
+Format of device driver:
+Offset	Size	Description
+h	WORD	signature A55Ah
+h	WORD	Stacker version * 64h
+h	WORD	offset of volume-specific information offset table
+		(list of WORDs, one per drive, containing offsets to various
+		information)
+h 56 BYTEs	n/a
+Eh	BYTE	volume number, set after INT 21/AX=4404h
+		(use to index into volume-specific info offset table)
+Fh 19 BYTEs	n/a
+h  4 BYTEs	ASCII string "SWAP"
+h 26 BYTEs	drive mapping table (one byte for each drive A: through Z:)
+Format of Stacker boot record:
+Offset	Size	Description
+F0h  8 BYTEs	Stacker signature (first byte is CDh)
+F8h	DWORD	pointer to start of Stacker device driver
+FCh	WORD	Stacker volume number
+FEh	WORD	???
+----------25----ALFF-------------------------
+INT 25 - PC-CACHE.SYS - INSTALLATION CHECK
+	AL = FFh
+	SI = 4358h
+Return: SI = 6378h if installed
+	    CX = segment of device driver PC-CACHE.SYS
+	    DX = version (major in DH, minor in DL)
+Note:	PC-CACHE.SYS is a small device driver used by PC-Cache v5.x to obtain
+	  access to certain disk drivers for devices such as Bernoulli drives
+SeeAlso: INT 13/AH=A0h
+----------26---------------------------------
+INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M)
+	AL = drive number (00h = A:, 01h = B:, etc)
+	CX = number of sectors to write
+	DX = starting logical sector number (0000h - highest sector on drive)
+	DS:BX -> data to write
+Return: CF clear if successful
+	CF set on error
+	    AH = status
+h device failed to respond (timeout)
+h seek operation failed
+h controller failed
+h data error (bad CRC)
+h DMA failure
+h requested sector not found
+h write-protected disk (INT 26 only)
+h bad address mark
+h bad command
+	    AL = error code (same as passed to INT 24 in DI)
+	may destroy all other registers except segment registers
+Notes:	original flags are left on stack, and must be popped by caller
+	this call bypasses the DOS filesystem
+BUG:	DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
+	invalid drive number
+SeeAlso: INT 13/AH=03h,INT 25
+----------26---------------------------------
+INT 26 - DOS 3.31+ - ABSOLUTE DISK WRITE (>32M hard-disk partition)
+	AL = drive number (0=A, 1=B, etc)
+	CX = FFFFh
+	DS:BX -> disk write packet (see below)
+Return: same as above
+Notes:	partition is potentially >32M (and requires this form of the call) if
+	  bit 1 of device attribute word in device driver is set
+	original flags are left on stack, and must be removed by caller
+	this call bypasses the DOS filesystem
+SeeAlso: INT 13/AH=03h,INT 25
+Format of disk write packet:
+Offset	Size	Description
+h	DWORD	sector number
+h	WORD	number of sectors to read
+h	DWORD	transfer address
+----------27---------------------------------
+INT 27 - DOS 1+ - TERMINATE AND STAY RESIDENT
+	DX = number of bytes to keep resident (max FFF0h)
+	CS = segment of PSP
+Return: never
+Notes:	this is an obsolete call
+	INT 22, INT 23, and INT 24 are restored from the PSP
+	does not close any open files
+	the minimum number of bytes which will remain resident is 110h for
+	  DOS 2.x and 60h for DOS 3+; there is no minimum for DOS 1.x, which
+	  implements this service in COMMAND.COM rather than the DOS kernel
+SeeAlso: INT 21/AH=31h
+----------28---------------------------------
+INT 28 - DOS 2+ - DOS IDLE INTERRUPT
+   Invoked each time one of the DOS character input functions loops while
+   waiting for input.  Since a DOS call is in progress even though DOS is
+   actually idle during such input waits, hooking this function is necessary
+   to allow a TSR to perform DOS calls while the foreground program is
+   waiting for user input.  The INT 28h handler may invoke any INT 21 function
+   except functions 00h through 0Ch.  Under DOS 2.x, the critical error flag
+   (the byte immediately after the InDOS flag) must be set in order to call
+   DOS functions 50h/51h without destroying the DOS stacks.
+Notes:	calls to INT 21/AH=3Fh,40h may not use a handle which refers to CON
+	at the time of the call, the InDOS flag (see INT 21/AH=34h) is normally
+	  set to 01h; if larger, DOS is truly busy and should not be reentered
+	the default handler is an IRET instruction
+	supported in OS/2 compatibility box
+SeeAlso: INT 21/AH=34h,INT 2A/AH=84h
+----------29---------------------------------
+INT 29 - DOS 2+ - FAST CONSOLE OUTPUT
+	AL = character to display
+Return: nothing
+Notes:	automatically called when writing to a device with bit 4 of its device
+	  driver header set (see also INT 21/AH=52h)
+	COMMAND.COM v3.2 and v3.3 compare the INT 29 vector against the INT 20
+	  vector and assume that ANSI.SYS is installed if the segment is larger
+	the default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh
+	the default handler under DESQview 2.2 understands the <Esc>[2J
+	  screen-clearing sequence, calls INT 10/AH=0Eh for all others
+SeeAlso: INT 79
+----------2A00-------------------------------
+INT 2A - NETWORK (Microsoft, LANtastic) - INSTALLATION CHECK
+	AH = 00h
+Return: AH <> 00h if installed
+SeeAlso: INT 5C
+----------2A0000-----------------------------
+INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK
+	AX = 0000h
+Return: AH = DDh
+SeeAlso: INT 5B
+----------2A01-------------------------------
+INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY
+	AH = 01h
+	ES:BX -> NCB (see INT 5C)
+Return: AL = NetBIOS error code
+	AH = 00h if no error
+	   = 01h on error
+SeeAlso: AH=04h,AX=0500h,INT 5B,INT 5C"NetBIOS"
+----------2A02-------------------------------
+INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE
+	AH = 02h
+	???
+Return: ???
+----------2A0300-----------------------------
+INT 2A - NETWORK (Microsoft,LANtastic) - CHECK DIRECT I/O
+	AX = 0300h
+	DS:SI -> ASCIZ device name (may be full path or only drive specifier--
+		must include the colon)
+Return: CF clear if direct physical addressing (INT 13,INT 25) permissible
+	CF set if access via files only
+Notes:	do not use direct disk accesses if this function returns CF set or the
+	  device is redirected (INT 21/AX=5F02h)
+	may take some time to execute
+	called by DOS kernel on INT 25 and INT 26
+SeeAlso: INT 13,INT 25,INT 26,INT 21/AX=5F02h
+----------2A04-------------------------------
+INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NetBIOS REQUEST
+	AH = 04h
+	AL = error retry
+h automatically retry request on errors 09h, 12h, and 21h
+h no retry
+	ES:BX -> Network Control Block (see INT 5C"NetBIOS")
+Return: AX = 0000h if successful
+	AH = 01h on error
+	    AL = error code
+Note:	invokes either INT 5B or INT 5C as appropriate
+SeeAlso: AH=01h,AX=0500h,INT 5B,INT 5C"NetBIOS"
+----------2A0500-----------------------------
+INT 2A - NETWORK (Microsoft,LANtastic) - GET NETWORK RESOURCE AVAILABILITY
+	AX = 0500h
+Return: AX reserved
+	BX = number of network names available
+	CX = number of network control blocks available
+	DX = number of network sessions available
+SeeAlso: AH=01h,AH=04h,INT 5C"NetBIOS"
+----------2A06-------------------------------
+INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL
+	AH = 06h
+	AL = 01h set concatenation mode (all printer output put in one job)
+h set truncation mode (default)
+		 printer open/close starts new print job
+h flush printer output and start new print job
+Return: CF set on error
+	    AX = error code
+	CF clear if successful
+Notes:	subfunction 03h is equivalent to Ctrl/Alt/keypad-*
+	LANtastic v4.x no longer supports this call
+SeeAlso: INT 21/AX=5D08h,INT 21/AX=5D09h,INT 2F/AX=1125h
+----------2A2001-----------------------------
+INT 2A - MS Networks or NETBIOS - ???
+	AX = 2001h
+	???
+Return: ???
+Note:	intercepted by DESQview 2.x
+----------2A2002-----------------------------
+INT 2A - NETWORK - ???
+	AX = 2002h
+	???
+Return: ???
+Note:	called by MSDOS 3.30-5.00 APPEND
+----------2A2003-----------------------------
+INT 2A - NETWORK - ???
+	AX = 2003h
+	???
+Return: ???
+Note:	called by MSDOS 3.30-5.00 APPEND
+----------2A7802-----------------------------
+INT 2A - NETWORK - PC LAN PROG v1.31+ - GET LOGGED ON USER NAME
+	AX = 7802h
+	ES:DI -> 8-byte buffer to be filled
+Return: AL = 00h if no user logged on to Extended Services
+	AL <> 00h if user logged on to Extended Services
+	    buffer at ES:DI filled with name, padded to 8 chars with blanks.
+----------2A80-------------------------------
+INT 2A - NETWORK - BEGIN DOS CRITICAL SECTION
+	AH = 80h
+	AL = critical section number (00h-0Fh)
+h DOS kernel, SHARE.EXE
+		apparently for maintaining the integrity of DOS/SHARE/NET
+		  data structures
+h DOS kernel
+		ensures that no multitasking occurs while DOS is calling an
+		  installable device driver
+h DOS 4.x only IFSFUNC
+h DOS 4.x only IFSFUNC
+h ASSIGN.COM
+Ah MSCDEX
+Notes:	normally hooked to avoid interrupting a critical section, rather than
+	  called
+	the handler should ensure that none of the critical sections are
+	  reentered, usually by suspending a task which attempts to reenter
+	  an active critical section
+	the DOS kernel does not invoke critical sections 01h and 02h unless it
+	  is patched.  DOS 3.1 through 3.31 contain a zero-terminated list of
+	  words beginning at offset 02C3h in the IBMDOS segment; each word
+	  contains the offset within the IBMDOS segment of a byte which must
+	  be changed from C3h to 50h to enable use of critical sections.
+SeeAlso: AH=81h,AH=82h,AH=87h,INT 21/AX=5D06h,INT 21/AX=5D0Bh
+----------2A81-------------------------------
+INT 2A - NETWORK - END DOS CRITICAL SECTION
+	AH = 81h
+	AL = critical section number (00h-0Fh) (see AH=80h)
+Notes:	normally hooked rather than called
+	the handler should reawaken any tasks which were suspended due to an
+	  attempt to enter the specified critical section
+SeeAlso: AH=80h,AH=82h,AH=87h
+----------2A82-------------------------------
+INT 2A - NETWORK - END DOS CRITICAL SECTIONS 0 THROUGH 7
+	AH = 82h
+Notes:	called by the INT 21h function dispatcher for function 0 and functions
+	  greater than 0Ch except 59h, and on process termination
+	the handler should reawaken any tasks which were suspended due to an
+	  attempt to enter one of the critical sections 0 through 7
+SeeAlso: AH=81h
+----------2A84-------------------------------
+INT 2A - Microsoft Networks - KEYBOARD BUSY LOOP
+	AH = 84h
+Note:	similar to DOS's INT 28h, called from inside the DOS keyboard input
+	  loop to allow network to process requests
+SeeAlso: INT 28
+----------2A87-------------------------------
+INT 2A - PRINT??? - CRITICAL SECTION
+	AH = 87h
+	AL = start/end
+h start
+h end
+Note:	called by PRINT.COM
+SeeAlso: AH=80h,AH=81h
+----------2A89-------------------------------
+INT 2A - Network - ???
+	AH = 89h
+	AL = ???  (ASSIGN uses 08h)
+	???
+Return: ???
+----------2A90-------------------------------
+INT 2A - IBM PC 3270 EMULATION PROGRAM - ???
+	AH = 90h
+	???
+Return: ???
+Note:	the LANtastic redirector and SERVER.EXE use this function with AL=01h,
+h-07h,0Ch-11h
+----------2AC2-------------------------------
+INT 2A - Network - ???
+	AH = C2h
+	AL = subfunction
+h ???
+h ???
+	BX = 0001h
+	???
+Return: ???
+Note:	called by DOS 3.30-5.00 APPEND
+----------2AFF90-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - ???
+	AX = FF90h
+Return: AX = ???
+Note:	PREDIR.EXE is the network printer redirector included as part of the
+	  PC/TCP system by FTP Software, Inc.
+----------2AFF91-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - ???
+	AX = FF91h
+	BX = ???
+Return: AX = status???
+----------2AFF92-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - INSTALLATION CHECK
+	AX = FF92h
+Return: AX = 0000h if installed
+	   BX = redirected printer port (FFFFh if no printers redirected)
+	   CX = version (CH = major, CL = minor)
+Note:	PREDIR.EXE is the network printer redirector included as part of the
+	  PC/TCP system by FTP Software, Inc.
+----------2AFF93-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - ???
+	AX = FF93h
+Return: AX = ???
+----------2AFF94-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - ???
+	AX = FF94h
+	BX = ???
+	CX = ???
+	DX = ???
+Return: AX = ???
+Note:	PREDIR.EXE is the network printer redirector included as part of the
+	  PC/TCP system by FTP Software, Inc.
+----------2AFF95-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - GET CONFIGURATION STRINGS
+	AX = FF95h
+	CX = what to get
+h ??? (returned pointer to "C:\COMMAND.COM")
+h spooling program
+h ???
+h spool file name
+h swap file name
+Return: AX = status
+h successful
+	BX:DX -> ASCIZ configuration string
+----------2AFF96-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION
+	AX = FF96h
+	CX = what to set
+h ???
+h print-on-hotkey state
+h print-on-exit state
+h print job timeout in clock ticks
+h print-on-EOF state
+	BX = new value (0000h disabled, 0001h enabled except for timeout)
+Return: AX = ???
+SeeAlso: AX=FF97h
+Note:	PREDIR.EXE is the network printer redirector included as part of the
+	  PC/TCP system by FTP Software, Inc.
+----------2AFF97-----------------------------
+INT 2A - PC/TCP PREDIR.EXE - GET PRINT JOB TERMINATION CONFIGURATION
+	AX = FF97h
+	CX = what to get
+h ???
+h print-on-hotkey state
+h print-on-exit state
+h print job timeout in clock ticks
+h print-on-EOF state
+Return: AX = status
+h successful
+	BX = old value (0000h disabled, 0001 enabled except for timeout)
+SeeAlso: AX=FF96h
+----------2B---------------------------------
+INT 2B - DOS 2+ - RESERVED
+Note:	this vector is not used in DOS versions <= 5.00, and points at an IRET
+----------2C---------------------------------
+INT 2C - DOS 2+ - RESERVED
+Note:	this vector is not used in DOS versions <= 5.00, and points at an IRET
+----------2C---------------------------------
+INT 2C - STARLITE architecture - KERNEL API
+Note:	STARLITE is an architecture by General Software for a series of MS-DOS
+	  compatible operating systems (OEM DOS, NETWORK DOS, and SMP DOS) to
+	  be released in 1991.	The interrupt number is subject to change
+	  before the actual release.
+----------2D---------------------------------
+INT 2D - DOS 2+ - RESERVED
+Note:	this vector is not used in DOS versions <= 5.00, and points at an IRET
+----------2D---------------------------------
+INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [proposal v3.4]
+	AH = multiplex number
+	AL = function
+h installation check
+		Return: AL = FFh if multiplex number in use
+			    CX = version number (CH = major, CL = minor)
+			    DX:DI -> signature string (see below) identifying
+				    the program using the multiplex number
+			AL = 00h if free
+h get entry point
+		Return: AL = FFh if entry point supported
+			    DX:BX -> entry point for bypassing interrupt chain
+			AL = 00h if all API calls via INT 2D
+h uninstall
+	    	DX:BX = return address for successful uninstall (may be
+			ignored by TSR)
+		Return: AL = status
+h not implemented
+h unsuccessful
+h can not uninstall yet, will do so when able
+h safe to remove, but no resident uninstaller
+			    	(TSR still enabled)
+			    	BX = segment of memory block with resident code
+h safe to remove, but no resident uninstaller
+			    	(TSR now disabled)
+			    	BX = segment of memory block with resident code
+h not safe to remove now, try again later
+			    FFh successful
+			return at DX:BX with AX destroyed if successful and
+			  TSR honors specific return address
+h request pop-up
+		Return: AL = status
+h not implemented or TSR is not a pop-up
+h can not pop up at this time, try again later
+h can not pop up yet, will do so when able
+h already popped up
+h unable to pop up, user intervention required
+			    	BX = standard reason code
+h unknown failure
+h interrupt chain passes through memory
+				    	  which must be swapped out to pop up
+h swap-in failed
+				CX = application's reason code if nonzero
+			    FFh TSR popped up and was exited by user
+				BX = return value
+h no return value
+h TSR unloaded
+h-00FFh reserved
+h-FFFFh application-dependent
+h determine chained interrupts
+	    	BL = interrupt number (except 2Dh)
+		Return: AL = status
+h not implemented
+h unable to determine
+h interrupt hooked
+h interrupt hooked, address returned
+			    	DX:BX -> TSR's interrupt BL handler
+h list of hooked interrupts returned
+			    	DX:BX -> interrupt hook list (see below)
+			    FFh interrupt not hooked
+		Notes:	since INT 2D is known to be hooked, the resident code
+			  need not test for BL=2Dh (to minimize its size), and
+			  the return value is therefore undefined in that case.
+			BL is ignored if the TSR returns AL=04h; in that case,
+			  the caller needs to scan the return list rather than
+			  making additional calls to this function.  If the
+			  return is not 00h or 04h, then the caller must cycle
+			  through the remaining interrupt numbers it wishes to
+			  check.
+			return values 01h thru 03h are disparaged and may be
+			  removed from future versions of the specification;
+			  they are included for compatibility with version 3.3
+h-0Fh reserved for future enhancements
+		Return: AL = 00h (not implemented)
+	    other  application-dependent
+Notes:	programs should not use fixed multiplex numbers; rather, a program
+	  should scan all multiplex numbers from 00h to FFh, remembering the
+	  first unused multiplex in case the program is not yet installed.
+	  For multiplex numbers which are in use, the program should compare
+	  the first 16 bytes of the signature string to determine whether it
+	  is already installed on that multiplex number.  If not previously
+	  installed, it should use the first free multiplex number.
+	functions other than 00h are not valid unless a program is installed
+	  on the selected multiplex number
+	to be considered fully compliant with version 3.4 of the specification,
+	  programs must implement at least functions 00h, 02h (no resident
+	  uninstall code required), and 04h (return value 04h).  The absolute
+	  minimum implementation has an overhead of 64 bytes plus 22 bytes per
+	  hooked interrupt (for the interrupt sharing protocol header and hook
+	  list entry).
+	the signature string and description may be used by memory mappers
+	  to display the installed programs
+	users of this proposal should adhere to the IBM interrupt sharing
+	  protocol (see below), which will permit removal of TSRs in
+	  arbitrary order and interrupt handler reordering.  All TSRs
+	  following this proposal should be removable, though they need not
+	  keep the code for removing themselves resident; it is acceptable
+	  for a separate program to perform the removal.
+	A sample implementation including example TSRs and utility programs
+	  may be found in a separate package distributed as AMISLnnn.ZIP
+	  (AMISL081.ZIP as of this writing).
+	Please let me know if you choose to follow this proposal.  A list of
+	  the private API calls you use would be appreciated, as well.
+SeeAlso: INT 2F
+Format of signature string:
+Offset	Size	Description
+h  8 BYTEs	blank-padded manufacturer's name (possibly abbreviated)
+h  8 BYTEs	blank-padded product name
+h 64 BYTEs	ASCIZ product description (optional, may be a single 00h)
+Note:	it is not necessary to reserve a full 64 bytes for the description,
+	  just enough to store the actual ASCIZ string
+Format of interrupt hook list [array]:
+Offset	Size	Description
+h	BYTE	interrupt number (last entry in array is 2Dh)
+h	WORD	offset within hook list's segment of the interrupt handler
+ 		this will point at the initial short jump of the interrupt
+		sharing protocol header (see below)
+Format of interrupt sharing protocol interrupt handler entry point:
+Offset	Size	Description
+h  2 BYTEs	short jump to actual start of interrupt handler, immediately
+		following this data block (EBh 10h)
+h	DWORD	address of next handler in chain
+h	WORD	signature 424Bh
+h	BYTE	EOI flag
+h software interrupt or secondary hardware interrupt handler
+h primary hardware interrupt handler (will issue EOI)
+h  2 BYTEs	short jump to hardware reset routine
+		must point at a valid FAR procedure (may be just RETF)
+Bh  7 BYTEs	reserved (0)
+Signatures known to be in use:
+ 'Crynwr  ' 'SPELLER '  TSR spelling-checker
+ 'heathh  ' 'Monitor '
+ 'Ralf B  ' 'FASTMOUS'  example TSR included with sample AMIS library code
+ 'Ralf B  ' 'NOLPT n '  example TSR -- turn LPTn into bit-bucket
+ 'Ralf B  ' 'NOTE    '  example TSR -- popup note-taker
+ 'Ralf B  ' 'SWITCHAR'  example TSR -- add switchar() support removed from DOS5
+ 'Ralf B  ' 'VGABLANK'  example TSR -- VGA-only screen blanker
+ 'TifaWARE' 'EATMEM  '	George A. Theall's public domain memory restrictor for
+ 			testing programs (v1.1+)
+	    'RECALL  '	public domain commandline editor and history (v1.2+)
+----------2E---------------------------------
+INT 2E - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION
+	DS:SI -> commandline to execute (see below)
+Return: all registers except CS:IP destroyed
+	AX = status (4DOS v4.0)
+h successful
+	   FFFFh error before processing command (not enough memory, etc)
+	   other error number returned by command
+Notes:	this call allows execution of arbitrary commands (including COMMAND.COM
+	  internal commands) without loading another copy of COMMAND.COM
+	if COMMAND.COM is the user's command interpreter, the primary copy
+	  executes the command; this allows the master environment to be
+	  modified by issuing a "SET" command, but changes in the master
+	  environment will not become effective until all programs descended
+	  from the primary COMMAND.COM terminate
+	since COMMAND.COM processes the string as if typed from the keyboard,
+	  the transient portion needs to be present, and the calling program
+	  must ensure that sufficient memory to load the transient portion can
+	  be allocated by DOS if necessary
+	results are unpredictable if invoked by a program run from a batch file
+	  because this call is not reentrant and COMMAND.COM uses the same
+	  internal variables when processing a batch file
+	hooked but ignored by 4DOS v3.0 COMMAND.COM replacement unless SHELL2E
+	  has been loaded
+Format of commandline:
+Offset	Size	Description
+h	BYTE	length of command string, not counting trailing CR
+h	var	command string
+  N	BYTE	0Dh (CR)
+----------2E----BXE22E-----------------------
+INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL
+	BX = E22Eh
+	DS:SI -> zero byte
+Return: if successful, SHELL2E terminates itself with INT 21/AH=4Ch
+----------2F---------------------------------
+INT 2F - Multiplex - NOTES
+	AH = identifier of program which is to handle the interrupt
+h-7Fh reserved for DOS
+	   C0h-FFh reserved for applications
+	AL is the function code
+   This is a general mechanism for verifying the presence of a TSR and
+   communicating with it.  When searching for a free identifier code for AH
+   using the installation check (AL=00h), the calling program should set
+   BX/CX/DX to 0000h and must not depend on any registers other than CS:IP
+   and SS:SP to be valid on return, since numerous programs now use additional
+   registers on input and/or output for the installation check.
+Note:	Since the multiplex chain is growing so long, and beginning to
+	  experience multiplex number collisions, I am proposing an alternate
+	  multiplex interrupt on INT 2D.  If you decide to use the alternate
+	  multiplex, please let me know.
+SeeAlso: INT 2D
+----------2F---------------------------------
+INT 2F - BMB Compuscience Canada Utilities Interface
+	AH = xx (dynamically assigned based upon a search for a multiplex
+		 number which doesn't answer installed)
+	AL = 00h installation check
+	ES:DI = EBEBh:BEBEh
+Return: AL = 00h not installed
+h not installed, not OK to install
+	     FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point
+		 to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a
+		 short form of the manufacturer's name, PPPPPPPP is a product
+		 name and NNNN is the product's version number
+----------2F---------------------------------
+INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY
+	AH = programmer-selected multiplex number
+	AL = function
+h installation check
+		Return: AL = FFh if installed
+h get TSR interrupt vectors
+		Return: DX:AX -> vector table (see below)
+h get TSR code segment
+		Return: AX = code segment for all interrupt handlers
+h call user exit routine and release TSR's memory
+h get signature string
+		Return: DX:AX -> counted string containing signature
+h get TSR's INT 2F handler
+		Return: DX:AX -> INT 2F handler
+h enable/disable TSR
+		BL = new state (00h disabled, 01h enabled)
+h activate TSR (popup if not disabled)
+h get hotkeys
+		BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
+		Return: AX = hotkey (AH = keyflags, AL = scancode)
+h set hotkey
+		BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
+		CX = new hotkey (CH = keyflags, CL = scancode)
+Ah-1Fh reserved
+Format of vector table entry:
+Offset	Size	Description
+h	BYTE	vector number (00h = end of table)
+h	DWORD	original vector
+h	WORD	offset of interrupt handler in TSR's code segment
+----------2F---------------------------------
+INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface
+	AH = xx (dynamically assigned based upon a search for a multiplex
+		 number from C0h to FFh which doesn't answer installed)
+	AL = 00h installation check
+	ES:DI = 1492h:1992h
+Return: AL = 00h not installed
+h not installed, not OK to install
+	     FFh installed; and if ES:DI was 1492h:1992h on entry, ES:DI will
+		 point to author_name_ver table (see below)
+	AH = FFh
+Note:	this interface permits advanced communication with TSRs: it is possible
+	  to make a generic unistall utility, advanced TSR relocator programs
+	  in order to fit fragmented memory areas, etc.
+See also: INT 2D"AMIS",INT 2F"Compuscience"
+Format of author_name_ver table:
+Offset	Size	Description
+ -16	WORD	segment in which really begins the TSR code (CS in programs
+		with PSP, XMS upper memory segment if installed as UMB...)
+ -14	WORD	offset in which really begins the TSR code (frecuently 100h
+		in *.COM programs and 0 in upper memory TSR's).
+ -12	WORD	memory used by TSR (in paragraphs). Knowing the memory area
+		used by TSR is possible to determine if hooked vectors are
+		still pointing it (and if it is safe the unistall process).
+ -10	BYTE	characteristics byte
+		bits 0-2: 000 normal program (with PSP)
+upper XMS memory block (needed HIMEM.SYS function
+			      to free memory when unistalling)
+device driver (*.SYS)
+device driver in EXE format
+xx others (reserved)
+		bits 3-6 reserved
+		bit 7 set if extra_table defined and supported
+ -9	BYTE	number of multiplex entry used (redefinition available). Note
+		that the TSR must be use THIS variable in it's INT 2Fh handler.
+ -8	WORD	offset to vector_area table (see bellow)
+ -6	WORD	offset to extra_area table (see bit 7 in offset -10 and bellow)
+ -4   4 BYTEs	"*##*"	(to insure that the TSR verify this agreement)
+h	var	"AUTHOR:PROGRAM_NAME:VERSION",0	 (variable length, this area
+		is used in order to determine if the TSR is already resident
+		and it's version code; the ':' char is used as delimiter)
+Format of vector_area table:
+Offset	Size	Description
+ -1	BYTE	number of vectors intercepted by TSR
+h	BYTE	first vector number
+h	DWORD	first vector pointer before installing the TSR
+h	BYTE	second vector number
+h	DWORD	second vector pointer before installing the TSR
+  .	  .	(and so on) Note that the TSR must be use THIS variables to
+		invoke previous interrupt handler routines.
+Format of extra_area table (needed only to improve relocation feature):
+Offset	Size	Description
+h	WORD	offset to external_ctrl table (0 if not supported)
+h	WORD	reserved for future use (0)
+Format of external_ctrl table:
+Offset	Size	Description
+h	BYTE	bit 0: TSR is relocatable (no absolute segment references)
+h	WORD	offset to a variable which can activate/inhibit the TSR
+ ---And if bit 0 in offset 00h is off:
+h	DWORD	pointer to ASCIIZ with pathname to executable file which
+		supports /SR parameter (silent installation & inhibit)
+h	DWORD	pointer to first variable to initialize on the copy reloaded
+		from the previous TSR still resident
+Bh	DWORD	pointer to last variable (all variables packed in one block)
+----------2F00-------------------------------
+INT 2F U - DOS 2.x PRINT.COM - ???
+	AH = 00h
+	???
+Return: ???
+Notes:	DOS 2.x PRINT.COM does not chain to previous INT 2F handler
+	values in AH other than 00h or 01h cause PRINT to return the number of
+	  files in the queue in AH
+SeeAlso: AH=01h
+----------2F0080-----------------------------
+INT 2F - DOS 3.1+ PRINT.COM - GIVE PRINT A TIME SLICE
+	AX = 0080h
+Return: after PRINT executes
+----------2F01-------------------------------
+INT 2F U - DOS 2.x PRINT.COM - ???
+	AH = 01h
+	???
+Return: ???
+Notes:	DOS 2.x PRINT.COM does not chain to previous INT 2F handler
+	values in AH other than 00h or 01h cause PRINT to return the number of
+	  files in the queue in AH
+SeeAlso: AH=00h
+----------2F0100-----------------------------
+INT 2F - DOS 3+ PRINT.COM - INSTALLATION CHECK
+	AX = 0100h
+Return: AL = status
+h not installed
+h not installed, but not OK to install
+	    FFh installed
+SeeAlso: AX=0101h
+----------2F0101-----------------------------
+INT 2F - DOS 3+ PRINT.COM - SUBMIT FILE FOR PRINTING
+	AX = 0101h
+	DS:DX -> submit packet (see below)
+Return: CF clear if successful
+	    AL = 01h added to queue
+Eh now printing
+	CF set on error
+	    AX = error code (see also INT 21/AH=59h)
+h invalid function
+h file not found
+h path not found
+h out of file handles
+h access denied
+h print queue full
+h spooler busy
+Ch name too long
+Fh invalid drive
+SeeAlso: AX=0102h
+Format of submit packet:
+Offset	Size	Description
+h	BYTE	level (must be 00h)
+h	DWORD	pointer to ASCIZ filename (no wildcards)
+----------2F0102-----------------------------
+INT 2F - DOS 3+ PRINT.COM - REMOVE FILE FROM PRINT QUEUE
+	AX = 0102h
+	DS:DX -> ASCIZ filename (wildcards allowed)
+Return: CF clear if successful
+	CF set on error
+	    AX = error code (see AX=0101h)
+SeeAlso: AX=0101h,AX=0103h
+----------2F0103-----------------------------
+INT 2F - DOS 3+ PRINT.COM - CANCEL ALL FILES IN PRINT QUEUE
+	AX = 0103h
+Return: CF clear if successful
+	CF set on error
+	    AX = error code (see AX=0101h)
+SeeAlso: AX=0102h
+----------2F0104-----------------------------
+INT 2F - DOS 3+ PRINT.COM - FREEZE PRINT QUEUE TO READ JOB STATUS
+	AX = 0104h
+Return: CF clear if successful
+	    DX = error count
+	    DS:SI -> print queue
+	CF set on error
+	    AX = error code (see AX=0101h)
+Notes:	the print queue is an array of 64-byte ASCIZ filenames terminated by
+	  an empty filename; the first name is the file currently being printed
+	printing is stopped until AX=0105h is called to prevent the queue
+	  from changing while the filenames are being read
+SeeAlso: AX=0101h,AX=0105h
+----------2F0105-----------------------------
+INT 2F - DOS 3+ PRINT.COM - RESTART PRINT QUEUE AFTER STATUS READ
+	AX = 0105h
+Return: CF clear if successful
+	CF set on error
+	    AX = error code (see AX=0101h)
+SeeAlso: AX=0104h
+----------2F0106-----------------------------
+INT 2F - DOS 3.3+ PRINT.COM - GET PRINTER DEVICE
+	AX = 0106h
+Return: CF set if files in print queue
+	    AX = error code 0008h (queue full)
+	    DS:SI -> device driver header
+	CF clear if print queue empty
+	    AX = 0000h
+Note:	documented for DOS 5+, but not documented for prior versions
+SeeAlso: AX=0104h
+----------2F0200-----------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK
+	AX = 0200h
+Return: AL = FFh if installed
+----------2F0201-----------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
+	AX = 0201h
+Return: nothing???
+Notes:	called by DOS 3.3+ PRINT.COM
+	AX=0202h appears to be the opposite function
+SeeAlso: AX=0202h
+----------2F0202-----------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
+	AX = 0202h
+	???
+Return: nothing???
+Note:	called by DOS 3.3+ PRINT.COM
+SeeAlso: AX=0201h
+----------2F0203-----------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
+	AX = 0203h
+Return: nothing???
+Notes:	called by DOS 3.3+ PRINT.COM
+	AX=0204h appears to be the opposite function
+SeeAlso: AX=0204h
+----------2F0204-----------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
+	AX = 0204h
+	???
+Return: nothing???
+Note:	called by DOS 3.3 PRINT.COM
+----------2F---------------------------------
+INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
+	AX = 02xxh
+	???
+Return: ???
+----------2F0500-----------------------------
+INT 2F U - DOS 3+ CRITICAL ERROR HANDLER - INSTALLATION CHECK
+	AX = 0500h
+Return: AL = 00h not installed, OK to install
+h not installed, can't install
+	     FFh installed
+Note:	this set of functions allows a user program to partially or completely
+	  override the default critical error handler's message in COMMAND.COM
+SeeAlso: AH=05h,INT 24
+----------2F05-------------------------------
+INT 2F U - DOS 3+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING
+	AH = 05h
+---DOS 3.x---
+	AL = extended error code (not zero)
+---DOS 4+ ---
+	AL = error type
+h DOS extended error code
+h parameter error
+	BX = error code
+Return: CF clear if successful
+	    ES:DI -> ASCIZ error message (read-only)
+	    AL = ???
+	CF set if error code can't be converted to string
+Notes:	called at start of COMMAND.COM's default critical error handler if
+	  installed by a user program, allowing partial or complete overriding
+	  of the default error message
+	subfunction 02h called by many DOS 4 external programs
+SeeAlso: AX=122Eh,INT 24
+----------2F0600-----------------------------
+INT 2F - DOS v3.0+ ASSIGN - INSTALLATION CHECK
+	AX = 0600h
+Return: AL = status
+h not installed
+h not installed, but not OK to install
+	    FFh installed
+Note:	ASSIGN is not a TSR in DR-DOS 5.0; it is internally replaced by SUBST
+	  (see INT 21/AX=2152h)
+SeeAlso: AX=0601h,INT 21/AX=2152h
+----------2F0601-----------------------------
+INT 2F U - DOS v3.0+ ASSIGN - GET DRIVE ASSIGNMENT TABLE
+	AX = 0601h
+Return: ES = segment of ASSIGN work area and assignment table
+Note:	under DOS 3+, the 26 bytes starting at ES:0103h specify which drive
+	  each of A: to Z: is mapped to.  Initially set to 01h 02h 03h....
+SeeAlso: AX=0600h
+----------2F0800-----------------------------
+INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
+	AX = 0800h
+Return:	AL = 00h not installed, OK to install
+h not installed, not OK to install
+	     FFh installed
+Note:	supported by DR-DOS 5.0
+----------2F0801-----------------------------
+INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
+	AX = 0801h
+	DS:DI -> drive data table (see AX=0803h)
+Notes:	moves down internal list of drive data tables, copying and modifying
+	  the drive description flags word for tables referencing same physical
+	  drive
+	data table appended to chain of tables
+	supported by DR-DOS 5.0
+SeeAlso: AX=0803h
+----------2F0802-----------------------------
+INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
+	AX = 0802h
+	ES:BX -> device driver request header (see below)
+Return: request header updated as per requested operation
+Notes:	supported by DR-DOS 5.0
+	DOS 3.2 executes this function on any AL value from 02h through F7h
+Format of device driver request header:
+Offset	Size	Description
+h	BYTE	length of request header
+h	BYTE	subunit within device driver
+h	BYTE	command code (see below)
+h	WORD	status (filled in by device driver)
+		bit 15: error
+		bits 14-11: reserved
+		bit 10: ??? set by DOS kernel on entry to some driver calls
+		bit 9: busy
+		bit 8: done
+		bits 7-0: error code if bit 15 set (see below)
+---DOS---
+h  8 BYTEs	reserved (unused in DOS 2.x and 3.x)
+---STARLITE architecture---
+h	DWORD	pointer to next request header
+h  4 BYTEs	reserved
+---command code 00h---
+Dh	BYTE	number of units (set by driver)
+Eh	DWORD	address of first free byte following driver (set by driver)
+h	DWORD	pointer to BPB array (set by block drivers only)
+h	BYTE	(DOS 3+) drive number for first unit of block driver (0=A)
+---command code 01h---
+Dh	BYTE	media descriptor
+Eh	BYTE	returned status
+h don't know
+h media has not changed
+		FFh media has been changed
+Fh	DWORD	(DOS 3+) pointer to previous volume ID if OPEN/CLOSE/RM bit in
+		  device header set and disk changed (set by driver)
+---command code 02h---
+Dh	BYTE	media descriptor
+Eh	DWORD	transfer address
+		-> scratch sector if NON-IBM FORMAT bit in device header set
+		-> first FAT sector otherwise
+h	DWORD	pointer to BPB (set by driver)
+---command codes 03h,0Ch--- (see also INT 21/AX=4402h,INT 21/AX=4403h)
+Dh	BYTE	media descriptor (block devices only)
+Eh	DWORD	transfer address
+h	WORD	byte count (character devices) or sector count (block devices)
+h	WORD	starting sector number (block devices only)
+h	DWORD	(DOS 3+) pointer to volume label if error 0Fh (set by driver)
+---command codes 04h,08h,09h---
+Dh	BYTE	media descriptor (block devices only)
+Eh	DWORD	transfer address
+h	WORD	byte count (character devices) or sector count (block devices)
+h	WORD	starting sector number (block devices only)
+h	DWORD	(DOS 3+) pointer to volume ID if error 0Fh returned
+Ah	DWORD	(DOS 4+) 32-bit starting sector number (block devices with
+		device attribute word bit 1 set only) (see INT 21/AH=52h)
+---command code 05h---
+Dh	BYTE	byte read from device if BUSY bit clear on return
+---command codes 06h,07h,0Ah,0Bh,0Dh,0Eh,0Fh,85h,88h---
+ no further fields
+---command code 10h---
+Dh	BYTE	unused
+Eh	DWORD	transfer address
+h	WORD	byte count
+---command codes 13h,19h---
+Dh	BYTE	category code
+h unknown
+h COMn:
+h CON
+h LPTn:
+h disk
+Eh (STARLITE) Media Access Control driver
+Eh	BYTE	function code
+h (STARLITE) MAC Bind request
+Fh	WORD	copy of DS at time of IOCTL call (apparently unused in DOS 3.3)
+h	WORD	offset of device driver header
+h	DWORD	pointer to parameter block from INT 21/AX=440Ch or AX=440Dh
+---command codes 80h,82h---
+Dh	BYTE	addressing mode
+h HSG (default)
+h Phillips/Sony Red Book
+Eh	DWORD	transfer address (ignored for command 82h)
+h	WORD	number of sectors to read
+		(if 0 for command 82h, request is an advisory seek)
+h	DWORD	starting sector number
+		logical sector number in HSG mode
+		frame/second/minute/unused in Red Book mode
+		(HSG sector = minute * 4500 + second * 75 + frame - 150)
+h	BYTE	data read mode
+h cooked (2048 bytes per frame)
+h raw (2352 bytes per frame, including EDC/ECC)
+h	BYTE	interleave size (number of sectors stored consecutively)
+Ah	BYTE	interleave skip factor (# sectors between consec portions)
+---command code 83h---
+Dh	BYTE	addressing mode (see above)
+Eh	DWORD	transfer address (ignored)
+h	WORD	number of sectors to read (ignored)
+h	DWORD	starting sector number (see also above)
+---command code 84h---
+Dh	BYTE	addressing mode (see above)
+Eh	DWORD	starting sector number (see also above)
+h	DWORD	number of sectors to play
+---command codes 86h,87h---
+Dh	BYTE	addressing mode (see above)
+Eh	DWORD	transfer address (ignored in write mode 0)
+h	WORD	number of sectors to write
+h	DWORD	starting sector number (see also above)
+h	BYTE	write mode
+h mode 0 (write all zeros)
+h mode 1 (default) (2048 bytes per sector)
+h mode 2 form 1 (2048 bytes per sector)
+h mode 2 form 2 (2336 bytes per sector)
+h	BYTE	interleave size (number of sectors stored consecutively)
+Ah	BYTE	interleave skip factor (# sectors between consec portions)
+Values for command code:
+h INIT
+h MEDIA CHECK (block devices)
+h BUILD BPB (block devices)
+h IOCTL INPUT
+h INPUT
+h NONDESTRUCTIVE INPUT, NO WAIT (character devices)
+h INPUT STATUS (character devices)
+h INPUT FLUSH (character devices)
+h OUTPUT
+h OUTPUT WITH VERIFY
+Ah OUTPUT STATUS (character devices)
+Bh OUTPUT FLUSH (character devices)
+Ch IOCTL OUTPUT
+Dh (DOS 3+) DEVICE OPEN
+Eh (DOS 3+) DEVICE CLOSE
+Fh (DOS 3+) REMOVABLE MEDIA (block devices)
+h (DOS 3+) OUTPUT UNTIL BUSY (character devices)
+h unused
+h unused
+h (DOS 3.2+) GENERIC IOCTL
+h unused
+h unused
+h unused
+h (DOS 3.2+) GET LOGICAL DEVICE
+h (DOS 3.2+) SET LOGICAL DEVICE
+h (DOS 5.0+) CHECK GENERIC IOCTL SUPPORT
+h (CD-ROM) READ LONG
+h (CD-ROM) reserved
+h (CD-ROM) READ LONG PREFETCH
+h (CD-ROM) SEEK
+h (CD-ROM) PLAY AUDIO
+h (CD-ROM) STOP AUDIO
+h (CD-ROM) WRITE LONG
+h (CD-ROM) WRITE LONG VERIFY
+h (CD-ROM) RESUME AUDIO
+Values for error code:
+h write-protect violation
+h unknown unit
+h drive not ready
+h unknown command
+h CRC error
+h bad drive request structure length
+h seek error
+h unknown media
+h sector not found
+h printer out of paper
+Ah write fault
+Bh read fault
+Ch general failure
+Dh reserved
+Eh (CD-ROM) media unavailable
+Fh invalid disk change
+----------2F0803-----------------------------
+INT 2F U - DOS 4+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST
+	AX = 0803h
+Return: DS:DI -> first drive data table in list
+Note:	not available under DR-DOS 5.0
+SeeAlso: AX=0801h
+Format of DOS 3.30 drive data table:
+Offset	Size	Description
+h	DWORD	pointer to next table
+h	BYTE	physical unit number (for INT 13)
+h	BYTE	logical drive number
+h 19 BYTEs	BIOS Parameter Block (see also INT 21/AH=53h)
+		Offset	Size	Description
+h	WORD	bytes per sector
+h	BYTE	sectors per cluster, FFh if unknown
+h	WORD	number of reserved sectors
+h	BYTE	number of FATs
+h	WORD	number of root dir entries
+h	WORD	total sectors
+Ah	BYTE	media descriptor, 00h if unknown
+Bh	WORD	sectors per FAT
+Dh	WORD	sectors per track
+Fh	WORD	number of heads
+h	WORD	number of hidden sectors
+h	BYTE	flags
+		bit 6: 16-bit FAT instead of 12-bit FAT
+Ah	WORD	number of DEVICE OPEN calls without corresponding DEVICE CLOSE
+Ch 11 BYTEs	volume label or "NO NAME    " if none (always "NO NAME" for
+		fixed media)
+h	BYTE	terminating null for volume label???
+h	BYTE	device type (see INT 21/AX=440Dh)
+h	WORD	bit flags describing drive
+		bit 0: fixed media
+		bit 1: door lock supported
+		bit 2: ??? (used in determining BPB to set for INT 21/AX=440Dh)
+		bit 3: all sectors in a track are the same size
+		bit 4: physical drive has multiple logical units
+		bit 5: current logical drive for physical drive
+		bit 6: ???
+		bit 7: ???
+		bit 8: ??? (related to disk change detection)
+Bh	WORD	number of cylinders
+Dh 19 BYTEs	BIOS Parameter Block for highest capacity supported
+h  3 BYTEs	???
+h  9 BYTEs	filesystem type???, default = "NO NAME	"
+		(apparently only MSDOS 3.30 fixed media, nulls for removable
+		media and PCDOS 3.30)
+Ch	BYTE	least-significant byte of last-accessed cylinder number
+---removable media---
+Dh	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
+---fixed media---
+Dh	WORD	partition (FFFFh = primary, 0001h = extended)
+Fh	WORD	absolute cylinder number of partition's start on physical
+		drive (always FFFFh if primary partition)
+Format of COMPAQ DOS 3.31 drive data table:
+Offset	Size	Description
+h	DWORD	pointer to next table
+h	BYTE	physical unit number (for INT 13)
+h	BYTE	logical drive number
+h 25 BYTEs	BIOS Parameter Block (see DOS 4.01 drive data table below)
+Fh  6 BYTEs	??? apparently always zeros
+h	BYTE	flags
+		bit 6: 16-bit FAT instead of 12-bit FAT
+: large volume???
+h	WORD	device-open count???
+h 11 BYTEs	volume label or "NO NAME    " if none (always "NO NAME" for
+		fixed media)
+h	BYTE	terminating null for volume label
+h	BYTE	device type (see INT 21/AX=440Dh)
+h	WORD	bit flags describing drive
+h	WORD	number of cylinders
+h 25 BYTEs	BIOS parameter block for highest capacity drive supports
+h  6 BYTEs	??? apparently always zeros
+h	BYTE	least-significant byte of last-accessed cylinder number
+---removable media---
+h	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
+---fixed media---
+h	WORD	partition (FFFFh = primary, 0001h = extended)
+Bh	WORD	absolute cylinder number of partition's start on physical
+		drive (always FFFFh if primary partition)
+Format of DOS 4.0-5.0 drive data table:
+Offset	Size	Description
+h	DWORD	pointer to next table
+h	BYTE	physical unit number (for INT 13)
+h	BYTE	logical drive number
+h 25 BYTEs	BIOS Parameter Block (see also INT 21/AH=53h)
+		Offset	Size	Description
+h	WORD	bytes per sector
+h	BYTE	sectors per cluster, FFh if unknown
+h	WORD	number of reserved sectors
+h	BYTE	number of FATs
+h	WORD	number of root dir entries
+h	WORD	total sectors (see offset 15h if zero)
+Ah	BYTE	media descriptor, 00h if unknown
+Bh	WORD	sectors per FAT
+Dh	WORD	sectors per track
+Fh	WORD	number of heads
+h	DWORD	number of hidden sectors
+h	DWORD	total sectors if WORD at 08h is zero
+Fh	BYTE	flags
+		bit 6: 16-bit FAT instead of 12-bit
+h  2 BYTEs	???
+h	BYTE	device type (see INT 21/AX=440Dh)
+h	WORD	bit flags describing drive
+		bit 0: fixed media
+		bit 1: door lock supported
+		bit 2: ???
+		bit 3: all sectors in a track are the same size
+		bit 4: physical drive has multiple logical units
+		bit 5: current logical drive for physical drive
+		bit 6: ???
+		bit 7: ???
+		bit 8: ???
+h	WORD	number of cylinders
+h 25 BYTEs	BIOS Parameter Block for highest capacity supported
+h  7 BYTEs	???
+---removable media---
+h	DWORD	time of last access in clock ticks (FFFFFFFFh if never)
+---fixed media, DOS 4.x---
+h	WORD	partition (FFFFh = primary, 0001h = extended)
+h	WORD	absolute cylinder number of partition's start on phys drive
+		(FFFFh if primary partition)
+---fixed media, DOS 5.0---
+h	WORD	??? apparently always 0001h
+h	WORD	absolute cylinder number of partition's start on phys drive
+------
+Bh 11 BYTEs	volume label or "NO NAME    " if none (apparently taken from
+		extended boot record rather than root directory)
+h	BYTE	terminating null for volume label???
+h	DWORD	serial number
+Bh  8 BYTEs	filesystem type ("FAT12	  " or "FAT16	")
+h	BYTE	terminating null for filesystem type???
+----------2F0C00-----------------------------
+INT 2F - AD-DOS - INSTALLATION CHECK
+	AX = 0C00h
+Return: AL = FF if installed
+	    BX = 4144H	('AD')
+	    CX = 2D44H	('-D')
+	    DX = 4F53H	('OS')
+Notes:	AD-DOS is the DOS version of the After Dark screen blanker for
+	  MS Windows
+	AH=0Ch is the default multiplex number
+SeeAlso: AX=0C01h
+----------2F0C01ES0000-----------------------
+INT 2F - AD-DOS - GET RESIDENT CODE SEGMENT
+	AX = 0C01h
+	ES = 0000h
+Return: CF clear succesful
+	    ES = AD-DOS TSR Code Segment
+	CF set if failed
+SeeAlso: AX=0C00h
+----------2F0C02-----------------------------
+INT 2F - AD-DOS - CHECK FOR NEW INPUT
+	AX = 0C02h
+Return: BX = status
+h no input since last check
+h new input available
+Note:	this call also resets the new-input flag
+----------2F0C03-----------------------------
+INT 2F - AD-DOS - SET MINUTES TO WAIT
+	AX = 0C03h
+	BX = minutes to wait before blanking screen
+	CF set
+Return: n/a???
+Notes:	AD-DOS is the DOS version of the After Dark screen blanker
+	AH=0Ch is the default multiplex number
+SeeAlso: AX=0C04h
+----------2F0C04-----------------------------
+INT 2F - AD-DOS - GET MINUTES TO WAIT
+	AX = 0C04h
+	CF set
+Return: BX = minutes to wait before blanking screen
+	???
+SeeAlso: AX=0C03h
+----------2F0C05-----------------------------
+INT 2F - AD-DOS - SET ENABLE??? FLAG
+	AX = 0C05h
+	BX = new state (0000h or 0001h) (default 0001h)
+	CF set
+Return: n/a???
+SeeAlso: AX=0C06h
+----------2F0C06-----------------------------
+INT 2F - AD-DOS - GET ENABLE??? FLAG
+	AX = 0C06h
+	Carry Set
+Return: BX = current state of ??? flag (0000h or 0001h)
+	???
+Notes:	AD-DOS is the DOS version of the After Dark screen blanker
+	AH=0Ch is the default multiplex number
+SeeAlso: AX=0C05h
+----------2F0C07-----------------------------
+INT 2F - AD-DOS - SET HOT KEY
+	AX = 0C07h
+	BX = hot key
+	CL = hot key shift status
+	CF set
+Return: n/a???
+SeeAlso: AX=0C08h
+----------2F0C08-----------------------------
+INT 2F - AD-DOS - GET CURRENT HOT KEY
+	AX = 0C08h
+	CF set
+Return: AX = status
+h successful
+		BX = Hot Key
+		CL = Hot Key Shift Status
+h otherwise
+SeeAlso: AX=0C07h
+----------2F0C09-----------------------------
+INT 2F - AD-DOS - ???
+	AX = 0C09h
+	Carry Set
+Return: AX = status
+h successful
+		???
+h otherwise
+Notes:	AD-DOS is the DOS version of the After Dark screen blanker
+	AH=0Ch is the default multiplex number
+----------2F0C0A-----------------------------
+INT 2F - AD-DOS - ???
+	AX = 0C0Ah
+	CF set
+Return: AX = status
+h successful
+		BH = ??
+		BL = ??
+Ah failed
+----------2F0C0B-----------------------------
+INT 2F - AD-DOS - ???
+	AX = 0C0Bh
+	CF set
+Return: AX = status
+h successful
+Bh failed
+----------2F0C0C-----------------------------
+INT 2F - AD-DOS - SET ??? INTERNAL FLAG TO 01h
+	AX = 0C0Ch
+	CF set
+Return: AX = status
+h successful
+Ch failed
+Notes:	AD-DOS is the DOS version of the After Dark screen blanker
+	AH=0Ch is the default multiplex number
+----------2F0C20-----------------------------
+INT 2F - AD-DOS - GET AND RESET VxD API STATUS
+	AX = 0C20h
+	CF set
+Return: AX = status
+h successful
+		BX = VxD API Status
+h no error
+h error
+h neither Windows 3.X enhanced mode nor
+				Windows/386 2.x is running
+h VM API entry point found
+h otherwise
+Note:	this call resets the VxD API Status to zero
+SeeAlso: AX=1602h,AX=1607h
+----------2F1000-----------------------------
+INT 2F - SHARE - INSTALLATION CHECK
+	AX = 1000h
+Return: AL = 00h  not installed, OK to install
+h  not installed, not OK to install
+	     FFh  installed
+BUGS:	values of AL other than 00h put DOS 3.x SHARE into an infinite loop
+	  (08E9: OR  AL,AL
+EB: JNZ 08EB) <- the buggy instruction (DOS 3.3)
+	values of AL other than described here put PCDOS 4.00 into the same
+	  loop (the buggy instructions are the same)
+Notes:	supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
+	if DOS 4.01 SHARE was automatically loaded, file sharing is in an
+	  inactive state (due to the undocumented /NC flag used by the autoload
+	  code) until this call is made
+	DOS 5.0 chains to the previous handler if AL <> 00h on entry
+SeeAlso: AX=1080h,INT 21/AH=52h
+----------2F1040-----------------------------
+INT 2F U - DOS 4 only SHARE internal - ???
+	AX = 1040h
+	???
+Return: AL = FFh???
+SeeAlso: AX=1000h
+----------2F1080-----------------------------
+INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS
+	AX = 1080h
+Return: AL = status
+	    F0h successful
+	    FFh checking was already on
+Note:	DOS 4.x SHARE has dual functions: FCB support for large (>32M) media
+	  and file sharing checks.  The undocumented commandline flag /NC can
+	  be used to disable the sharing code.
+SeeAlso: AX=1000h,AX=1081h
+----------2F1081-----------------------------
+INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS
+	AX = 1081h
+Return: AL = status
+	    F0h successful
+	    FFh checking was already off
+Note:	(see AX=1080h)
+SeeAlso: AX=1000h,AX=1080h
+----------2F10FF-----------------------------
+INT 2F U - Multiplex - DR-DOS 5.0 - ???
+	AX = 10FFh
+	ES:BX -> ???
+Note:	sets pointer in kernel
+----------2F1100-----------------------------
+INT 2F - NETWORK REDIRECTOR - INSTALLATION CHECK
+	AX = 1100h
+Return: AL = 00h  not installed, OK to install
+h  not installed, not OK to install
+	     FFh  installed
+Notes:	called by DOS 3.1+ kernel
+	In DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the
+	  PC LAN Program redirector; DOS 5.0 moves the calls back into the
+	  redirector
+----------2F1100-----------------------------
+INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK
+	AX = 1100h
+	STACK: WORD DADAh
+Return: AL = 00h not installed, OK to install
+		STACK unchanged
+	   = 01h not installed, not OK to install
+		STACK unchanged
+	   = FFh installed
+		STACK: WORD ADADh
+----------2F1101-----------------------------
+INT 2F U - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY
+	AX = 1101h
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified directory name
+	SDA CDS pointer -> current directory structure for drive with dir
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1103h,AX=1105h,INT 21/AH=3Ah,INT 21/AH=60h
+----------2F1102-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY
+	AX = 1102h
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified directory name
+	SDA CDS pointer -> current directory structure for drive with dir
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	appears to be identical to AX=1101h
+SeeAlso: AX=1101h
+----------2F1103-----------------------------
+INT 2F U - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY
+	AX = 1103h
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified directory name
+	SDA CDS pointer -> current directory structure for drive with dir
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1101h,AX=1105h,INT 21/AH=39h,INT 21/AH=60h
+----------2F1104-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY
+	AX = 1104h
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified directory name
+	SDA CDS pointer -> current directory structure for drive with dir
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	appears to be identical to AX=1103h
+SeeAlso: AX=1103h
+----------2F1105-----------------------------
+INT 2F U - NETWORK REDIRECTOR - CHDIR
+	AX = 1105h
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified directory name
+	SDA CDS pointer -> current directory structure for drive with dir
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    CDS updated with new path
+Notes:	called by DOS 3.1+ kernel
+	directory string in CDS should not have a terminating backslash unless
+	  the current directory is the root
+SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h
+----------2F1106-----------------------------
+INT 2F U - NETWORK REDIRECTOR - CLOSE REMOTE FILE
+	AX = 1106h
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    SFT updated (except handle count, which DOS manages itself)
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1201h,AX=1227h,INT 21/AH=3Eh
+----------2F1107-----------------------------
+INT 2F U - NETWORK REDIRECTOR - COMMIT REMOTE FILE
+	AX = 1107h
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    all buffers for file flushed
+	    directory entry updated
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AH=68h,INT 21/AX=5D01h
+----------2F1108-----------------------------
+INT 2F U - NETWORK REDIRECTOR - READ FROM REMOTE FILE
+	AX = 1108h
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+	CX = number of bytes
+	SS = DOS DS
+	SDA DTA field -> user buffer
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    CX = number of bytes read (0000h = end of file)
+	    SFT updated
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1109h,AX=1229h,INT 21/AH=3Fh,INT 21/AX=5D06h
+----------2F1109-----------------------------
+INT 2F U - NETWORK REDIRECTOR - WRITE TO REMOTE FILE
+	AX = 1109h
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+	CX = number of bytes
+	SS = DOS DS
+	SDA DTA field -> user buffer
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    CX = number of bytes written
+	    SFT updated
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h
+----------2F110A-----------------------------
+INT 2F U - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
+	AX = 110Ah
+	BX = file handle
+	CX:DX = starting offset
+	SI = high word of size
+	STACK: WORD low word of size
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+	SS = DOS DS
+Return: CF set on error
+	   AL = DOS error code (see INT 21/AH=59h)
+	STACK unchanged
+Notes:	called by DOS 3.10-3.31 kernel
+	the redirector is expected to resolve lock conflicts
+SeeAlso: AX=110Bh,INT 21/AH=5Ch
+----------2F110A-----------------------------
+INT 2F U - NETWORK REDIRECTOR (DOS 4+) - LOCK/UNLOCK REGION OF FILE
+	AX = 110Ah
+	BL = function
+h lock
+h unlock
+	DS:DX -> parameter block (see below)
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive containing file
+	SS = DOS DS
+Return: CF set on error
+	   AL = DOS error code (see INT 21/AH=59h)
+Notes:	called by DOS 4.0+ kernel
+	the redirector is expected to resolve lock conflicts
+SeeAlso: AX=110Bh,INT 21/AH=5Ch
+Format of parameter block:
+Offset	Size	Description
+h	DWORD	start offset
+h	DWORD	size of region
+----------2F110B-----------------------------
+INT 2F U - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE
+	AX = 110Bh
+	BX = file handle
+	CX:DX = starting offset
+	SI = high word of size
+	STACK: WORD low word of size
+	ES:DI -> SFT for file
+	    SFT DPB field -> DPB of drive containing file
+Return: CF set on error
+	   AL = DOS error code (see INT 21/AH=59h)
+	STACK unchanged
+Note:	called by DOS 3.1-3.31 kernel; DOS 4.0+ calls AX=110Ah instead
+SeeAlso: AX=110Ah,INT 21/AH=5Ch
+----------2F110C-----------------------------
+INT 2F U - NETWORK REDIRECTOR - GET DISK SPACE
+	AX = 110Ch
+	ES:DI -> current directory structure for desired drive
+Return: AL = sectors per cluster
+	AH = media ID byte
+	BX = total clusters
+	CX = bytes per sector
+	DX = number of available clusters
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AH=36h
+----------2F110D-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 110Dh
+	SDA first filename pointer -> name of file
+	???
+Return: ???
+Note:	appears to be similar to AX=110Fh
+SeeAlso: AX=110Fh
+----------2F110E-----------------------------
+INT 2F U - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES
+	AX = 110Eh
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified name of file
+	SDA CDS pointer -> current directory structure for drive with file
+	STACK: WORD new file attributes
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=110Fh,INT 21/AX=4301h,INT 21/AH=60h
+----------2F110F-----------------------------
+INT 2F U - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE
+	AX = 110Fh
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified name of file
+	SDA CDS pointer -> current directory structure for drive with file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    AX = file attributes
+	    BX:DI = file size
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=110Eh,INT 21/AX=4300h,INT 21/AH=60h
+----------2F1110-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 1110h
+	SDA first filename pointer -> name of file
+	???
+Return: ???
+Note:	appears to be similar to AX=110Eh
+SeeAlso: AX=110Eh
+----------2F1111-----------------------------
+INT 2F U - NETWORK REDIRECTOR - RENAME REMOTE FILE
+	AX = 1111h
+	SS = DS = DOS DS
+	SDA first filename pointer = offset of fully-qualified old name
+	SDA second filename pointer = offset of fully-qualified new name
+	SDA CDS pointer -> current directory structure for drive with file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AH=56h,INT 21/AH=60h
+----------2F1112-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 1112h
+	SS = DS = DOS DS
+	SDA first filename pointer -> name of file
+	???
+Return: ???
+SeeAlso: AX=1111h
+----------2F1113-----------------------------
+INT 2F U - NETWORK REDIRECTOR - DELETE REMOTE FILE
+	AX = 1113h
+	SS = DS = DOS DS
+	SDA first filename pointer -> fully-qualified filename in DOS DS
+	SDA CDS pointer -> current directory structure for drive with file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Notes:	called by DOS 3.1+ kernel
+	the filespec may contain wildcards
+SeeAlso: INT 21/AH=41h,INT 21/AH=60h
+----------2F1114-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 1114h
+	SDA first filename pointer -> name of file
+	???
+Return: ???
+SeeAlso: AX=1113h
+----------2F1115-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 1115h
+	SS = DOS DS
+	ES:DI -> SFT ???
+	???
+Return: ???
+SeeAlso: AX=112Eh
+----------2F1116-----------------------------
+INT 2F U - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE
+	AX = 1116h
+	ES:DI -> uninitialized SFT
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified name of file to open
+	STACK: WORD file open mode (see INT 21/AH=3Dh)
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    SFT filled (except handle count, which DOS manages itself)
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1106h,AX=1117h,AX=1118h,AX=112Eh,INT 21/AH=3Dh,INT 21/AH=60h
+----------2F1117-----------------------------
+INT 2F U - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE
+	AX = 1117h
+	ES:DI -> uninitialized SFT
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified name of file to open
+	SDA CDS pointer -> current directory structure for drive with file
+	STACK: WORD file creation mode
+			low byte = file attributes
+			high byte = 00h normal create, 01h create new file
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    SFT filled (except handle count, which DOS manages itself)
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1106h,AX=1116h,AX=1118h,AX=112Eh,INT 21/AH=3Ch,INT 21/AH=60h
+----------2F1118-----------------------------
+INT 2F U - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS
+	AX = 1118h
+	ES:DI -> uninitialized SFT
+	SS = DOS DS
+	SDA first filename pointer -> fully-qualified name of file
+	STACK: WORD file creation mode
+			low byte = file attributes
+			high byte = 00h normal create, 01h create new file
+Return: ???
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel when creating a file on a drive for which the
+	  SDA CDS pointer has offset FFFFh
+SeeAlso: AX=1106h,AX=1116h,AX=1117h,AX=112Eh,INT 21/AH=60h
+----------2F1119-----------------------------
+INT 2F U - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS
+	AX = 1119h
+	SS = DS = DOS DS
+	[DTA] = uninitialized 21-byte findfirst search data (see INT 21/AH=4Eh)
+	SDA first filename pointer -> fully-qualified search template
+	SDA search attribute = attribute mask for search
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    [DTA] = updated findfirst search data
+		    (bit 7 of first byte must be set)
+	    [DTA+15h] = standard directory entry for file
+Notes:	called by DOS 3.1+ kernel
+	DOS 4.x IFSFUNC returns CF set, AX=0003h
+----------2F111A-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 111Ah
+	???
+Return: CF set
+	    AX = error code (03h for DOS 4.01 IFSFUNC)
+----------2F111B-----------------------------
+INT 2F U - NETWORK REDIRECTOR - FINDFIRST
+	AX = 111Bh
+	SS = DS = DOS DS
+	[DTA] = uninitialized 21-byte findfirst search data (see INT 21/AH=4Eh)
+	SDA first filename pointer -> fully-qualified search template
+	SDA CDS pointer -> current directory structure for drive with file
+	SDA search attribute = attribute mask for search
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    [DTA] = updated findfirst search data
+		    (bit 7 of first byte must be set)
+	    [DTA+15h] = standard directory entry for file
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=111Ch,INT 21/AH=4Eh,INT 21/AH=60h
+----------2F111C-----------------------------
+INT 2F U - NETWORK REDIRECTOR - FINDNEXT
+	AX = 111Ch
+	SS = DS = DOS DS
+	[DTA] = 21-byte findfirst search data (see INT 21/AH=4Eh)
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    [DTA] = updated findfirst search data
+		    (bit 7 of first byte must be set)
+	    [DTA+15h] = standard directory entry for file
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=111Bh,INT 21/AH=4Fh
+----------2F111D-----------------------------
+INT 2F U - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS
+	AX = 111Dh
+	DS???
+	SS = DOS DS
+Return: ???
+Notes:	called by DOS 3.1+ kernel
+	closes all FCBs opened by process
+----------2F111E-----------------------------
+INT 2F U - NETWORK REDIRECTOR - DO REDIRECTION
+	AX = 111Eh
+	SS = DOS DS
+	STACK: WORD function to execute
+F00h  get redirection mode
+			BL = type (03h printer, 04h disk)
+			Return: BH = state (00h off, 01h on)
+F01h  set redirection mode
+			BL = type (03h printer, 04h disk)
+			BH = state (00h off, 01h on)
+F02h  get redirection list entry
+			BX = redirection list index
+			DS:SI -> 16-byte local device name buffer
+			ES:DI -> 128-byte network name buffer
+			Return: must set user's BX to device type and CX to
+				stored parameter value, using AX=1218h to get
+				stack frame address
+F03h  redirect device
+			BL = device type (see INT 21/AX=5F03h)
+			CX = stored parameter value
+			DS:SI -> ASCIZ source device name
+			ES:DI -> destination ASCIZ network path + ASCIZ passwd
+F04h  cancel redirection
+			DS:SI -> ASCIZ device name or network path
+F05h  get redirection list extended entry
+			BX = redirection list index
+			DS:SI -> buffer for ASCIZ source device name
+			ES:DI -> buffer for destination ASCIZ network path
+			Return: BH = status flag
+				BL = type (03h printer, 04h disk)
+				CX = stored parameter value
+				BP = NETBIOS local session number
+F06h  similar to 5F05h???
+Return: CF set on error
+	    AX = error code (see INT 21/AH=59h)
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AX=5F00h,INT 21/AX=5F01h,INT 21/AX=5F02h,INT 21/AX=5F03h
+SeeAlso: INT 21/AX=5F04h,INT 21/AX=5F05h,INT 21/AX=5F06h
+----------2F111F-----------------------------
+INT 2F U - NETWORK REDIRECTOR - PRINTER SETUP
+	AX = 111Fh
+	STACK: WORD function
+E02h  set printer setup
+E03h  get printer setup
+E04h  set printer mode
+E05h  get printer mode
+Return: CF set on error
+	    AX = error code (see INT 21/AH=59h)
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AX=5E02h,INT 21/AX=5E03h,INT 21/AX=5E04h,INT 21/AX=5E05h
+----------2F1120-----------------------------
+INT 2F U - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS
+	AX = 1120h
+	DS = DOS DS
+	???
+Return: CF clear (successful)
+Notes:	called by DOS 3.1+ kernel
+	uses CDS array pointer and LASTDRIVE= entries in DOS list of lists
+SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h
+----------2F1121-----------------------------
+INT 2F U - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE
+	AX = 1121h
+	CX:DX = offset (in bytes) from end
+	ES:DI -> SFT
+	    SFT DPB field -> DPB of drive with file
+	SS = DOS DS
+Return: CF set on error
+	    AL = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+	    DX:AX = new file position
+Note:	called by DOS 3.1+ kernel
+SeeAlso: AX=1228h,INT 21/AH=42h
+----------2F1122-----------------------------
+INT 2F U - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK
+	AX = 1122h
+	SS = DOS DS
+	???
+Return: ???
+Note:	called by DOS 3.1+ kernel
+----------2F1123-----------------------------
+INT 2F U - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME
+	AX = 1123h
+	DS:SI -> ASCIZ filename to canonicalize
+	ES:DI -> 128-byte buffer for qualified name
+Return: CF set if not resolved
+Notes:	called by MSDOS 3.1+ kernel, but not called by DRDOS 5.0 unless the
+	  filename matches the name of a character device
+	called first when DOS attempts to resolve a filename (unless inside an
+	  AX=5D00h server call); if this fails, DOS resolves the name locally
+SeeAlso: AX=1221h,INT 21/AH=60h
+----------2F1124-----------------------------
+INT 2F U - NETWORK REDIRECTOR - PRINTER OFF???
+	AX = 1124h
+	ES:DI -> SFT
+	SS = DOS DS
+	???
+Return: CX = ???
+Note:	called by DOS 3.1+ kernel if AX=1126h returns CF set
+SeeAlso: AX=1126h
+----------2F1125-----------------------------
+INT 2F U - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
+	AX = 1125h
+	STACK: WORD subfunction
+D07h get print stream state
+			Return: DL = current state
+D08h set print stream state
+			DL = new state
+D09h finish print job
+Return: CF set on error
+	    AX = error code (see INT 21/AH=59h)
+	STACK unchanged
+Note:	called by DOS 3.1+ kernel
+SeeAlso: INT 21/AX=5D07h,INT 21/AX=5D08h,INT 21/AX=5D09h
+----------2F1126-----------------------------
+INT 2F U - NETWORK REDIRECTOR - PRINTER ON/OFF???
+	AX = 1126h
+	ES:DI -> SFT for file handle 4???
+	SS = DOS DS???
+	???
+Return: CF set on error
+Notes:	called by DOS 3.1+ kernel
+	called when print echoing (^P, ^PrtSc) changes state and STDPRN has
+	  bit 11 of the device information word in the SFT set
+SeeAlso: AX=1124h
+----------2F1127-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - UNUSED
+	AX = 1127h
+Return: CF set
+	    AX = 0001h (invalid function) (see INT 21/AH=59h)
+----------2F1128-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - UNUSED
+	AX = 1128h
+Return: CF set
+	    AX = 0001h (invalid function) (see INT 21/AH=59h)
+----------2F1129-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - UNUSED
+	AX = 1129h
+Return: CF set
+	    AX = 0001h (invalid function) (see INT 21/AH=59h)
+----------2F112A-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 112Ah
+	DS = DOS DS
+	???
+Return: ???
+Note:	does something to each IFS driver
+----------2F112B-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL???
+	AX = 112Bh
+	SS = DOS DS
+	CX = function/category
+	DS:DX -> parameter block
+	STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
+	???
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	called by DOS 4.0 kernel
+----------2F112C-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 112Ch
+	SS = DOS DS
+	SDA current SFT pointer -> SFT for file
+	???
+Return: CF set on error
+----------2F112D-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 112Dh
+	BL = subfunction (value of AL on INT 21)
+h truncate open file to zero length
+		ES:DI -> SFT for file
+		Return: CF clear
+	    else ???
+		Return: CX = ??? (00h or 02h for DOS 4.01)
+	ES:DI -> SFT
+	SS = DOS DS
+Return: DS = DOS DS
+Note:	called by DOS 4.0 kernel on INT 21/AX=5702h,INT 21/AX=5703h,
+	  INT 21/AX=5704h
+----------2F112E-----------------------------
+INT 2F U - NETWORK REDIRECTOR (DOS 4+) - EXTENDED OPEN/CREATE FILE
+	AX = 112Eh
+	SS = DS = DOS DS
+	ES:DI -> uninitialized SFT for file
+	STACK: WORD file attribute for created/truncated file
+			low byte = file attributes
+			high byte = 00h normal create/open, 01h create new file
+	SDA first filename pointer -> fully-qualified filename
+	SDA extended file open action = action code (see INT 21/AX=6C00h)
+	SDA extended file open mode = open mode for file (see INT 21/AX=6C00h)
+Return: CF set on error
+	    AX = error code
+	CF clear if successful
+	    CX = result code
+h file opened
+h file created
+h file replaced (truncated)
+	    SFT initialized (except handle count, which DOS manages itself)
+Note:	called by DOS 4.0 kernel
+SeeAlso: AX=1115h,AX=1116h,AX=1117h,INT 21/AX=6C00h
+----------2F112F-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - ???
+	AX = 112Fh
+	SS = DOS DS
+	STACK: WORD function in low byte
+h ???
+		    DS:SI -> Current Directory Structure???
+		    CL = drive (1=A:)
+h ???
+		    DS:SI -> ???
+		    CL = file handle???
+h ???
+		    DS:SI -> Current Directory Structure???
+		    DI = ???
+		    CX = drive (1=A:)
+	???
+Return: CF set on error
+	    AX = DOS error code (see INT 21/AH=59h)
+	CF clear if successful
+Note:	called by DOS 4.0 kernel
+SeeAlso: INT 21/AH=6Bh
+----------2F1130-----------------------------
+INT 2F U - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT
+	AX = 1130h
+Return: ES = CS of resident IFSFUNC
+----------2F1186-----------------------------
+INT 2F - LAN Manager Enhanced DOS API - DosReadAsynchNmPipe
+	AX = 1186h
+	???
+Return: ???
+Note:	LAN Manager enhance mode adds features beyond the standard redirector
+	  file/printer services
+SeeAlso: AX=118Fh,INT 21/AX=5F39h
+----------2F118A-----------------------------
+INT 2F - LAN Manager 2.0 DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE
+	AX = 118Ah
+	???
+Return: ???
+SeeAlso: AX=1186h,AH=41h,AH=42h,AH=4Bh
+----------2F118F-----------------------------
+INT 2F - LAN Manager Enhanced DOS API - DosWriteAsynchNmPipe
+	AX = 118Fh
+	???
+Return: ???
+SeeAlso: AX=1186h,INT 21/AX=5F3Ah
+----------2F1200-----------------------------
+INT 2F U - DOS 3+ internal - INSTALLATION CHECK
+	AX = 1200h
+Return: AL = FFh (for compatibility with other INT 2F functions)
+----------2F1201-----------------------------
+INT 2F U - DOS 3+ internal - CLOSE CURRENT FILE
+	AX = 1201h
+	SS = DOS DS
+	SDA current SFT pointer -> SFT of file to close
+Return: CF set on error
+	BX???
+	CX new reference count of SFT
+	ES:DI -> SFT for file
+SeeAlso: AX=1106h,AX=1227h,INT 21/AH=3Eh
+----------2F1202-----------------------------
+INT 2F U - DOS 3+ internal - GET INTERRUPT ADDRESS
+	AX = 1202h
+	STACK: WORD vector number
+Return: ES:BX -> interrupt vector
+	STACK unchanged
+----------2F1203-----------------------------
+INT 2F U - DOS 3+ internal - GET DOS DATA SEGMENT
+	AX = 1203h
+Return: DS = segment of IBMDOS.COM/MSDOS.SYS
+----------2F1204-----------------------------
+INT 2F U - DOS 3+ internal - NORMALIZE PATH SEPARATOR
+	AX = 1204h
+	STACK: WORD character to normalize
+Return: AL = normalized character (forward slash turned to backslash, all
+		others unchanged)
+	ZF set if path separator
+	STACK unchanged
+----------2F1205-----------------------------
+INT 2F U - DOS 3+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT
+	AX = 1205h
+	STACK: WORD character to output
+Return: STACK unchanged
+Note:	can be called only from within DOS
+----------2F1206-----------------------------
+INT 2F U - DOS 3+ internal - INVOKE CRITICAL ERROR
+	AX = 1206h
+	DI = error code
+	BP:SI -> device driver header
+	SS = DOS DS
+	STACK: WORD value to be passed to INT 24 in AX
+Return: AL = 0-3 for Abort, Retry, Ignore, Fail
+	STACK unchanged
+SeeAlso: INT 24
+----------2F1207-----------------------------
+INT 2F U - DOS 3+ internal - MAKE DISK BUFFER MOST-RECENTLY USED
+	AX = 1207h
+	DS:DI -> disk buffer
+Return: nothing
+Notes:	can be called only from within DOS
+	buffer is moved to end of buffer list (least-recently used is first)
+SeeAlso: AX=120Fh
+----------2F1208-----------------------------
+INT 2F U - DOS 3+ internal - DECREMENT SFT REFERENCE COUNT
+	AX = 1208h
+	ES:DI -> SFT
+Return: AX = original value of reference count
+Note:	if the reference count was 1, it is set to FFFFh (since 0 indicates
+	  that the SFT is not in use).	It is the caller's responsibility to
+	  set the reference count to zero after cleaning up.
+----------2F1209-----------------------------
+INT 2F U - DOS 3+ internal - FLUSH AND FREE DISK BUFFER
+	AX = 1209h
+	DS:DI -> disk buffer
+Return: disk buffer marked unused, contents written to disk if buffer dirty
+Note:	can be called only from within DOS
+SeeAlso: AX=120Eh,AX=1215h
+----------2F120A-----------------------------
+INT 2F U - DOS 3+ internal - PERFORM CRITICAL ERROR INTERRUPT
+	AX = 120Ah
+	DS = SS = DOS DS
+	STACK: WORD extended error code
+Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail)
+	CF clear if retry, set otherwise
+	STACK unchanged
+Notes:	can only be called during a DOS function call, as it uses various
+	  fields in the SDA to set up the registers for the INT 24
+	reportedly sets current DPB's first root directory sector to 1
+SeeAlso: INT 24
+----------2F120B-----------------------------
+INT 2F U - DOS 3+ internal - SIGNAL SHARING VIOLATION TO USER
+	AX = 120Bh
+	ES:DI -> system file table entry for previous open of file
+	STACK: WORD extended error code (should be 20h--sharing violation)
+Return: CF clear if operation should be retried
+	CF set if operation should not be retried
+	    AX = error code (20h) (see INT 21/AH=59h)
+	STACK unchanged
+Notes:	can only be called during a DOS function call
+	should only be called if an attempt was made to open an already-open
+	  file contrary to the sharing rules
+	invokes INT 24 if SFT file opened via FCB or in compatibility mode with
+	  inheritance allowed
+----------2F120C-----------------------------
+INT 2F U - DOS 3+ internal - OPEN DEVICE AND SET SFT OWNER???
+	AX = 120Ch
+	SDA current SFT pointer -> SFT for file
+	DS = SS = DOS DS
+Return: ES, DI, AX destroyed
+Notes:	invoked "device open" call on device driver for SFT
+	changes owner of last-accessed SFT to calling process if it was opened
+	  via FCB
+	called by network redirectors
+----------2F120D-----------------------------
+INT 2F U - DOS 3+ internal - GET DATE AND TIME
+	AX = 120Dh
+	SS = DOS DS
+Return: AX = current date in packed format (see INT 21/AX=5700h)
+	DX = current time in packed format (see INT 21/AX=5700h)
+SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch
+----------2F120E-----------------------------
+INT 2F U - DOS 3+ internal - MARK ALL DISK BUFFERS UNREFERENCED
+	AX = 120Eh
+	SS = DOS DS
+Return: DS:DI -> first disk buffer
+Note:	clears "referenced" flag on all disk buffers
+SeeAlso: AX=1209h,AX=1210h,INT 21/AH=0Dh
+----------2F120F-----------------------------
+INT 2F U - DOS 3+ internal - MAKE BUFFER MOST RECENTLY USED
+	AX = 120Fh
+	DS:DI -> disk buffer
+	SS = DOS DS
+Return: DS:DI -> next buffer in buffer list
+Note:	indicated buffer moved to end of chain
+SeeAlso: AX=1207h
+----------2F1210-----------------------------
+INT 2F U - DOS 3+ internal - FIND UNREFERENCED DISK BUFFER
+	AX = 1210h
+	DS:DI -> first disk buffer to check
+Return: ZF clear if found
+	    DS:DI -> first unreferenced disk buffer
+	ZF set if not found
+SeeAlso: AX=120Eh
+----------2F1211-----------------------------
+INT 2F U - DOS 3+ internal - NORMALIZE ASCIZ FILENAME
+	AX = 1211h
+	DS:SI -> ASCIZ filename to normalize
+	ES:DI -> buffer for normalized filename
+Return: destination buffer filled with uppercase filename, with slashes turned
+	to backslashes
+SeeAlso: AX=121Eh,AX=1221h
+----------2F1212-----------------------------
+INT 2F U - DOS 3+ internal - GET LENGTH OF ASCIZ STRING
+	AX = 1212h
+	ES:DI -> ASCIZ string
+Return: CX = length of string
+SeeAlso: AX=1225h
+----------2F1213-----------------------------
+INT 2F U - DOS 3+ internal - UPPERCASE CHARACTER
+	AX = 1213h
+	STACK: WORD character to convert to uppercase
+Return: AL = uppercase character
+	STACK unchanged
+----------2F1214-----------------------------
+INT 2F U - DOS 3+ internal - COMPARE FAR POINTERS
+	AX = 1214h
+	DS:SI = first pointer
+	ES:DI = second pointer
+Return: ZF set if pointers are equal, ZF clear if not equal
+----------2F1215-----------------------------
+INT 2F U - DOS 3+ internal - FLUSH BUFFER
+	AX = 1215h
+	DS:DI -> disk buffer
+	SS = DOS DS
+	STACK: WORD drives for which to skip buffer
+		ignore buffer if drive same as high byte, or bytes differ and
+		the buffer is for a drive OTHER than that given in low byte
+Return: STACK unchanged
+Note:	can be called only from within DOS
+SeeAlso: AX=1209h
+----------2F1216-----------------------------
+INT 2F U - DOS 3+ internal - GET ADDRESS OF SYSTEM FILE TABLE
+	AX = 1216h
+	BX = system file table entry number
+Return: CF clear if successful
+	    ES:DI -> system file table entry
+	CF set if BX greater than FILES=
+SeeAlso: AX=1220h
+----------2F1217-----------------------------
+INT 2F U - DOS 3+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE
+	AX = 1217h
+	SS = DOS DS
+	STACK: WORD drive (0 = A:, 1 = B:, etc)
+Return: CF set on error
+	    (drive > LASTDRIVE)
+	CF clear if successful
+	    DS:SI -> current directory structure for specified drive
+	STACK unchanged
+SeeAlso: AX=1219h
+----------2F1218-----------------------------
+INT 2F U - DOS 3+ internal - GET CALLER'S REGISTERS
+	AX = 1218h
+Return: DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
+Note:	only valid while within DOS
+----------2F1219-----------------------------
+INT 2F U - DOS 3+ internal - SET DRIVE???
+	AX = 1219h
+	SS = DOS DS
+	STACK: WORD drive (0 = default, 1 = A:, etc)
+Return: ???
+	STACK unchanged
+Notes:	calls AX=1217h
+	builds a current directory structure if inside server call
+	  (INT 21/AX=5D00h)
+SeeAlso: AX=1217h,AX=121Fh
+----------2F121A-----------------------------
+INT 2F U - DOS 3+ internal - GET FILE'S DRIVE
+	AX = 121Ah
+	DS:SI -> filename
+Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid)
+	DS:SI -> filename without leading X: (if present)
+SeeAlso: INT 21/AH=19h,INT 21/AH=60h
+----------2F121B-----------------------------
+INT 2F U - DOS 3+ internal - SET YEAR/LENGTH OF FEBRUARY
+	AX = 121Bh
+	CL = year - 1980
+Return: AL = number of days in February
+Note:	requires DS to be set to the DOS code segment
+SeeAlso: INT 21/AH=2Bh
+----------2F121C-----------------------------
+INT 2F U - DOS 3+ internal - CHECKSUM MEMORY
+	AX = 121Ch
+	DS:SI -> start of memory to checksum
+	CX = number of bytes
+	DX = initial checksum
+	SS = DOS DS
+Return: AX, CX destroyed
+	DX = checksum
+	DS:SI -> first byte after checksummed range
+Note:	used by DOS to determine day count since 1/1/80 given a date
+SeeAlso: AX=121Dh
+----------2F121D-----------------------------
+INT 2F U - DOS 3+ internal - SUM MEMORY
+	AX = 121Dh
+	DS:SI -> memory to add up
+	CX = 0000h
+	DX = limit
+Return: AL = byte which exceeded limit
+	CX = number of bytes before limit exceeded
+	DX = remainder after adding first CX bytes
+	DS:SI -> byte beyond the one which exceeded the limit
+Note:	used by DOS to determine year or month given day count since 1/1/80
+SeeAlso: AX=121Ch
+----------2F121E-----------------------------
+INT 2F U - DOS 3+ internal - COMPARE FILENAMES
+	AX = 121Eh
+	DS:SI -> first ASCIZ filename
+	ES:DI -> second ASCIZ filename
+Return: ZF set if filenames equivalent, ZF clear if not
+SeeAlso: AX=1211h,AX=1221h
+----------2F121F-----------------------------
+INT 2F U - DOS 3+ internal - BUILD CURRENT DIRECTORY STRUCTURE
+	AX = 121Fh
+	SS = DOS DS
+	STACK: WORD drive letter
+Return: ES:DI -> current directory structure (will be overwritten by next call)
+	STACK unchanged
+----------2F1220-----------------------------
+INT 2F U - DOS 3+ internal - GET JOB FILE TABLE ENTRY
+	AX = 1220h
+	BX = file handle
+Return: CF set on error
+	    AL = 6 (invalid file handle)
+	CF clear if successful
+	    ES:DI -> JFT entry for file handle in current process
+Note:	the byte pointed at by ES:DI contains the number of the SFT for the
+	  file handle, or FFh if the handle is not open
+SeeAlso: AX=1216h,AX=1229h
+----------2F1221-----------------------------
+INT 2F U - DOS 3+ internal - CANONICALIZE FILE NAME
+	AX = 1221h
+	DS:SI -> file name to be fully qualified
+	ES:DI -> 128-byte buffer for resulting canonical file name
+	SS = DOS DS
+Return: (see INT 21/AH=60h)
+Note:	identical to INT 21/AH=60h
+SeeAlso: AX=1123h,INT 21/AH=60h
+----------2F1222-----------------------------
+INT 2F U - DOS 3+ internal - SET EXTENDED ERROR INFO
+	AX = 1222h
+	SS = DOS data segment
+	SS:SI -> 4-byte records
+		BYTE	error code, FFh = last record
+		BYTE	error class, FFh = don't change
+		BYTE	suggested action, FFh = don't change
+		BYTE	error locus, FFh = don't change
+	SDA error code set
+Return: SI destroyed
+	SDA error class, error locus, and suggested action fields set
+Note:	can be called only from within DOS
+SeeAlso: AX=122Dh,INT 21/AH=59h
+----------2F1223-----------------------------
+INT 2F U - DOS 3+ internal - CHECK IF CHARACTER DEVICE
+	AX = 1223h
+	SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
+	SDA+22Bh (DOS 4.0x) = eight-character blank-padded name
+Return: CF set if no character device by that name found
+	CF clear if found
+	    BH = low byte of device attribute word
+Note:	can only be called from within DOS (assumes DS=SS=DOS DS)
+SeeAlso: INT 21/AX=5D06h,INT 21/AX=5D0Bh
+----------2F1224-----------------------------
+INT 2F U - DOS 3+ internal - DELAY
+	AX = 1224h
+	SS = DOS DS
+Return: after delay set by INT 21/AX=440Bh, unless in server call
+	  (INT 21/AX=5D00h)
+Note:	delay is dependent on the processor speed, and is skipped entirely if
+	  inside a server call
+SeeAlso: INT 21/AX=440Bh,INT 21/AH=52h
+----------2F1225-----------------------------
+INT 2F U - DOS 3+ internal - GET LENGTH OF ASCIZ STRING
+	AX = 1225h
+	DS:SI -> ASCIZ string
+Return: CX = length of string
+SeeAlso: AX=1212h
+----------2F1226-----------------------------
+INT 2F U - DOS 3.3+ internal - OPEN FILE
+	AX = 1226h
+	CL = access mode
+	DS:DX -> ASCIZ filename
+Return: CF set on error
+	    AL = error code (see INT 21/AH=59h)
+	CF clear if successful
+	    AX = file handle
+Notes:	can only be called from within DOS (assumes SS=DOS DS)
+	equivalent to INT 21/AH=3Dh
+SeeAlso: AX=1227h,INT 21/AH=3Dh
+----------2F1227-----------------------------
+INT 2F U - DOS 3.3+ internal - CLOSE FILE
+	AX = 1227h
+	BX = file handle
+Return: CF set on error
+	    AL = 06h invalid file handle
+	CF clear if successful
+Notes:	can only be called from within DOS (assumes SS=DOS DS)
+	equivalent to INT 21/AH=3Eh
+SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh
+----------2F1228BP4200-----------------------
+INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER
+	AX = 1228h
+	BP = 4200h, 4201h, 4202h (see INT 21/AH=42h)
+	BX = file handle
+	CX:DX = offset in bytes
+	SS = DOS DS
+Return: as for INT 21/AH=42h
+Notes:	equivalent to INT 21/AH=42h, but may only be called from inside a DOS
+	  function call
+	sets user stack frame pointer to dummy buffer, moves BP to AX, performs
+	  LSEEK, and restores frame pointer
+SeeAlso: INT 21/AH=42h
+----------2F1229-----------------------------
+INT 2F U - DOS 3.3+ internal - READ FROM FILE
+	AX = 1229h
+	BX = file handle
+	CX = number of bytes to read
+	DS:DX -> buffer
+	SS = DOS DS
+Return: as for INT 21/AH=3Fh
+Note:	equivalent to INT 21/AH=3Fh, but may only be called when already inside
+	  a DOS function call
+SeeAlso: AX=1226h,INT 21/AH=3Fh
+----------2F122A-----------------------------
+INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT
+	AX = 122Ah
+	BX = entry point to set (0001h or 0002h)
+	DS:SI -> FASTOPEN entry point
+		(entry point not set if SI = FFFFh for DOS 4+)
+Return: CF set if specified entry point already set
+Notes:	entry point in BX is ignored under DOS 3.30
+	both entry points set to same handler by DOS 4.01
+DOS 3.30+ FASTOPEN is called with:
+	AL = 01h  ???
+	    CX = ??? seems to be offset
+	    DI = ??? seems to be offset
+	    SI = offset in DOS DS of filename
+	AL = 02h  ???
+	AL = 03h  open file???
+	    SI = offset in DOS DS of filename
+	AL = 04h  ???
+	    AH = subfunction (00h,01h,02h)
+	    ES:DI -> ???
+	    CX = ??? (subfunctions 01h and 02h only)
+Returns: CF set on error or not installed
+Note: function 03h calls function 01h first
+PCDOS 4.01 FASTOPEN is additionally called with:
+	AL = 04h ???
+	    AH = 03h
+	    ???
+	AL = 05h ???
+	AL = 0Bh ???
+	AL = 0Ch ???
+	AL = 0Dh ???
+	AL = 0Eh ???
+	AL = 0Fh ???
+	AL = 10h ???
+MSDOS 5.0 FASTOPEN is additionally called with:
+	AL = 04h ???
+	    AH = 03h
+	    ???
+	AL = 05h ???
+	    DL = drive (00h = A:)
+	    ???
+	AL = 06h ???
+----------2F122B-----------------------------
+INT 2F U - DOS 3.3+ internal - IOCTL
+	AX = 122Bh
+	BP = 44xxh
+	SS = DOS DS
+	additional registers as appropriate for INT 21/AX=44xxh
+Return: as for INT 21/AH=44h
+Notes:	equivalent to INT 21/AH=44h, but may only be called when already inside
+	  a DOS function call
+	sets user stack frame pointer to dummy buffer, moves BP to AX, performs
+	  IOCTL, and restores frame pointer
+SeeAlso: INT 21/AH=44h
+----------2F122C-----------------------------
+INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN
+	AX = 122Ch
+Return: BX:AX -> header of second device driver (NUL is first) in driver chain
+SeeAlso: INT 21/AH=52h
+----------2F122D-----------------------------
+INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE
+	AX = 122Dh
+Return: AX = current extended error code
+SeeAlso: AX=1222h,INT 21/AH=59h
+----------2F122E-----------------------------
+INT 2F U - DOS 4+ internal - GET OR SET ERROR TABLE ADDRESSES
+	AX = 122Eh
+	DL = subfunction
+h get standard DOS error table (errors 00h-12h,50h-5Bh)
+		Return: ES:DI -> error table
+h set standard DOS error table
+		ES:DI -> error table
+h get parameter error table (errors 00h-0Ah)
+		Return: ES:DI -> error table
+h set parameter error table
+		ES:DI -> error table
+h get critical/SHARE error table (errors 13h-2Bh)
+		Return: ES:DI -> error table
+h set critical/SHARE error table
+		ES:DI -> error table
+h get ??? error table
+		Return: ES:DI -> error table or 0000h:0000h
+h set ??? error table
+		ES:DI -> error table
+h get error message retriever (see below)
+		Return: ES:DI -> FAR procedure to fetch error message
+h set ??? error table
+		ES:DI -> error table
+Notes:	if the returned segment on a "get" is 0001h, then the offset specifies
+	  the offset of the error message table within COMMAND.COM, and the
+	  procedure returned by DL=08h should be called
+	DOS 5.0 COMMAND.COM does not allow setting any of the addresses; they
+	  are always returned with segment 0001h
+SeeAlso: AX=0500h,INT 21/AH=59h
+Format of DOS 4.x error table:
+Offset	Size	Description
+h	BYTE	FFh
+h  2 BYTEs	04h,00h (DOS version???)
+h	BYTE	number of error headers following
+h 2N WORDs	table of all error headers for table
+		Offset	Size	Description
+h	WORD	error message number
+h	WORD	offset of error message from start of header
+				error messages are count byte followed by msg
+Note:	DOS 5 error tables consist of one word per error number; each word
+	  contains either the offset of a counted string or 0000h
+Call error retrieval function with:
+	AX = error number
+	DI = offset of error table
+Return: ES:DI -> error message (counted string)
+Notes:	this function needs to access COMMAND.COM if the messages were not
+	  loaded into memory permanently with /MSG; the caller should assume
+	  that the returned message will be overwritten by the next call of
+	  the function
+	supported by DR-DOS 5.0
+----------2F122F-----------------------------
+INT 2F U - DOS 4+ internal - SET DOS VERSION NUMBER TO RETURN
+	AX = 122Fh
+	DX = DOS version number (0000h = return true DOS version)
+Note:	not available under DR-DOS 5.0
+SeeAlso: INT 21/AH=30h
+----------2F13-------------------------------
+INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER
+	AH = 13h
+	DS:DX -> interrupt handler disk driver calls on read/write
+	ES:BX = address to restore INT 13 to on system halt (exit from root
+		 shell) or warm boot (INT 19)
+Return: DS:DX from previous invocation of this function
+	ES:BX from previous invocation of this function
+Notes:	IO.SYS hooks INT 13 and inserts one or more filters ahead of the
+	  original INT 13 handler.  The first is for disk change detection
+	  on floppy drives, the second is for tracking formatting calls and
+	  correcting DMA boundary errors, the third is for working around
+	  problems in a particular version of IBM's ROM BIOS
+	before the first call, ES:BX points at the original BIOS INT 13; DS:DX
+	  also points there unless IO.SYS has installed a special filter for
+	  hard disk reads (on systems with model byte FCh and BIOS date
+	  "01/10/84" only), in which case it points at the special filter
+	most DOS 3.3+ disk access is via the vector in DS:DX, although a few
+	  functions are still invoked via an INT 13 instruction
+	this is a dangerous security loophole for any virus-monitoring software
+	  which does not trap this call (many Bulgarian viruses are known to
+	  use it to get the original ROM entry point)
+SeeAlso: INT 13/AH=01h,INT 19
+----------2F1400-----------------------------
+INT 2F - NLSFUNC.COM - INSTALLATION CHECK
+	AX = 1400h
+Return: AL = 00h not installed, OK to install
+h not installed, not OK
+	     FFh installed
+Notes:	called by DOS v3.3+ kernel
+	supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
+	supported by DR-DOS 5.0
+	documented for MS-DOS 5.0, but undocumented in prior versions
+----------2F1401-----------------------------
+INT 2F U - NLSFUNC.COM - CHANGE CODE PAGE
+	AX = 1401h
+	DS:SI -> internal code page structure (see below)
+	BX = new code page
+	DX = country code???
+Return: AL = status
+h successful
+	     else DOS error code
+Note:	called by DOS v3.3+ kernel
+SeeAlso: INT 21/AH=66h
+Format of DOS 3.30 internal code page structure:
+Offset	Size	Description
+h  8 BYTEs	???
+h 64 BYTEs	name of country information file
+h	WORD	system code page
+Ah	WORD	number of supported subfunctions
+Ch  5 BYTEs	data to return for INT 21/AX=6502h
+h  5 BYTEs	data to return for INT 21/AX=6504h
+h  5 BYTEs	data to return for INT 21/AX=6505h
+Bh  5 BYTEs	data to return for INT 21/AX=6506h
+h 41 BYTEs	data to return for INT 21/AX=6501h
+----------2F1402-----------------------------
+INT 2F U - NLSFUNC.COM - GET COUNTRY INFO
+	AX = 1402h
+	BP = subfunction (same as AL for INT 21/AH=65h)
+	BX = code page
+	DX = country code
+	DS:SI -> internal code page structure (see AX=1401h)
+	ES:DI -> user buffer
+	CX = size of user buffer
+Return: AL = status
+h successful
+	    else DOS error code
+Notes:	called by DOS v3.3+ kernel on INT 21/AH=65h
+	code page structure apparently only needed for COUNTRY.SYS pathname
+SeeAlso: AX=1403h,AX=1404h,INT 21/AH=65h
+----------2F1403-----------------------------
+INT 2F U - NLSFUNC.COM - SET COUNTRY INFO
+	AX = 1403h
+	DS:SI -> internal code page structure (see AX=1401h)
+	BX = code page
+	DX = country code
+Return: AL = status
+	     ???
+Note:	called by DOS v3.3+ kernel on INT 21/AH=38h
+SeeAlso: AX=1402h,AX=1404h,INT 21/AH=38h"SET"
+----------2F1404-----------------------------
+INT 2F U - NLSFUNC.COM - GET COUNTRY INFO
+	AX = 1404h
+	BX = code page
+	DX = country code
+	DS:SI -> internal code page structure (see AX=1401h)
+	ES:DI -> user buffer
+Return: AL = status
+	     ???
+Notes:	called by DOS v3.3+ kernel on INT 21/AH=38h
+	code page structure apparently only needed for COUNTRY.SYS pathname
+SeeAlso: AX=1402h,AX=1403h,INT 21/AH=38h"GET"
+----------2F14FE-----------------------------
+INT 2F U - DR-DOS 5.0 NLSFUNC - ???
+	AX = 14FEh
+	DI = ???
+	???
+Return: ???
+Note:	DR-DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
+	  or FFh on entry.
+SeeAlso: AX=14FFh
+----------2F14FF-----------------------------
+INT 2F U - DR-DOS 5.0 NLSFUNC - ???
+	AX = 14FFh
+	???
+Return: ???
+Note:	DR-DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
+	  or FFh on entry.
+SeeAlso: AX=14FEh
+----------2F1500-----------------------------
+INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK
+	AX = 1500h
+Return: AX = FFFFh
+	ES:DI -> ??? (graphics data?)
+Note:	this installation check conflicts with the CD-ROM Extensions
+	  installation check; moved to AX=AC00h in later versions
+SeeAlso: AX=AC00h
+----------2F1500BX0000-----------------------
+INT 2F - CD-ROM - INSTALLATION CHECK
+	AX = 1500h
+	BX = 0000h
+Return: BX = number of CD-ROM drive letters used
+	CX = starting drive letter (0=A:)
+Notes:	this installation check DOES NOT follow the format used by other
+	  software
+	this installation check conflicts with the DOS 4.00 GRAPHICS.COM
+	  installation check
+SeeAlso: INT 2F/AX=D000h"Lotus"
+----------2F1501-----------------------------
+INT 2F - CD-ROM - GET DRIVE DEVICE LIST
+	AX = 1501h
+	ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
+Return: buffer filled, for each drive letter
+	  BYTE	subunit number in driver
+	  DWORD address of device driver header
+----------2F1502-----------------------------
+INT 2F - CD-ROM - GET COPYRIGHT FILE NAME
+	AX = 1502h
+	ES:BX -> 38-byte buffer for name of copyright file
+	CX = drive number (0=A:)
+Return: CF set if drive is not a CD-ROM drive
+	    AX = 15 (invalid drive)
+	CF clear if successful
+SeeAlso: AX=1503h
+----------2F1503-----------------------------
+INT 2F - CD-ROM - GET ABSTRACT FILE NAME
+	AX = 1503h
+	ES:BX -> 38-byte buffer for name of abstract file
+	CX = drive number (0=A:)
+Return: CF set if drive is not a CD-ROM drive
+	    AX = 15 (invalid drive)
+	CF clear if successful
+SeeAlso: AX=1502h
+----------2F1504-----------------------------
+INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME
+	AX = 1504h
+	ES:BX -> 38-byte buffer for name of bibliographic documentation file
+	CX = drive number (0=A:)
+Return: CF set if drive is not a CD-ROM drive
+	    AX = 15 (invalid drive)
+	CF clear if successful
+----------2F1505-----------------------------
+INT 2F - CD-ROM - READ VTOC
+	AX = 1505h
+	ES:BX -> 2048-byte buffer
+	CX = drive number (0=A:)
+	DX = sector index (0=first volume descriptor,1=second,...)
+Return: CF set on error
+	    AX = error code (15=invalid drive,21=not ready)
+	CF clear if successful
+	    AX = volume descriptor type (1=standard,FFh=terminator,0=other)
+----------2F1506-----------------------------
+INT 2F - CD-ROM - TURN DEBUGGING ON
+	AX = 1506h
+	BX = debugging function to enable
+Note:	reserved for development
+SeeAlso: AX=1507h
+----------2F1507-----------------------------
+INT 2F - CD-ROM - TURN DEBUGGING OFF
+	AX = 1507h
+	BX = debugging function to disable
+Note:	reserved for development
+SeeAlso: AX=1506h
+----------2F1508-----------------------------
+INT 2F - CD-ROM - ABSOLUTE DISK READ
+	AX = 1508h
+	ES:BX -> buffer
+	CX = drive number (0=A:)
+	SI:DI = starting sector number
+	DX = number of sectors to read
+Return: CF set on error
+	    AL = error code (15=invalid drive,21=not ready)
+	CF clear if successful
+SeeAlso: AX=1509h
+===== INT 2F - CD-ROM - ABSOLUTE DISK WRITE =====
+	AX = 1509h
+	ES:BX -> buffer
+	CX = drive number (0=A:)
+	SI:DI = starting sector number
+	DX = number of sectors to write
+Note:	corresponds to INT 26h and is currently reserved and nonfunctional
+SeeAlso: AX=1508h
+----------2F150A-----------------------------
+INT 2F - CD-ROM - RESERVED
+	AX = 150Ah
+----------2F150B-----------------------------
+INT 2F - CD-ROM v2.00+ - DRIVE CHECK
+	AX = 150Bh
+	CX = drive number (0=A:)
+Return: BX = ADADh if MSCDEX.EXE installed
+	    AX = 0000h if drive not supported
+		nonzero if supported
+SeeAlso: AX=150Dh
+----------2F150C-----------------------------
+INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION
+	AX = 150Ch
+Return: BH = major version
+	BL = minor version
+Note:	MSCDEX.EXE versions prior to 2.00 return BX=0
+----------2F150D-----------------------------
+INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS
+	AX = 150Dh
+	ES:BX -> buffer for drive letter list (1 byte per drive)
+Return: buffer filled with drive numbers (0=A:).  Each byte corresponds
+	to the drive in the same position for function 1501h
+SeeAlso: AX=150Bh
+----------2F150E-----------------------------
+INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE
+	AX = 150Eh
+	BX = subfunction
+h get preference
+		DX = 0000h
+		Return: DX = preference settings
+h set preference
+		DH = volume descriptor preference
+h = primary volume descriptor
+h = supplementary volume descriptor
+		DL = supplementary volume descriptor preference
+h = shift-Kanji
+	CX = drive number (0=A:)
+Return: CF set on error
+	    AX = error code (15=invalid drive,1=invalid function)
+	CF clear if successful
+----------2F150F-----------------------------
+INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY
+	AX = 150Fh
+	CL = drive number (0=A:)
+	CH bit 0 = copy flag
+		clear if direct copy
+		set if copy to structure which removed ISO/High Sierra diffs
+	ES:BX -> ASCIZ path name
+	SI:DI -> buffer for directory entry (see below)
+		 minimum 255 bytes for direct copy
+Return: CF set on error
+	    AX = error code
+	CF clear if succesful
+	    AX = disk format (0=High Sierra,1=ISO 9660)
+Format of directory entry (direct copy):
+Offset	Size	Description
+h	BYTE  length of directory entry
+h	BYTE  length of XAR in Logical Block Numbers
+h	DWORD LBN of data, Intel (little-endian) format
+h	DWORD LBN of data, Motorola (big-endian) format
+Ah	DWORD length of file, Intel format
+Eh	DWORD length of file, Motorola format
+---High Sierra---
+h  6 BYTEs date and time
+h	BYTE  bit flags
+h	BYTE  reserved
+---ISO 9660---
+h  7 BYTEs date and time
+h	BYTE  bit flags
+---both formats---
+Ah	BYTE  interleave size
+Bh	BYTE  interleave skip factor
+Ch	WORD  volume set sequence number, Intel format
+Eh	WORD  volume set sequence number, Motorola format
+h	BYTE  length of file name
+h  N BYTEs file name
+	BYTE (optional) padding if filename is odd length
+      N BYTEs system data
+Format of directory entry (canonicalized):
+Offset	Size	Description
+h	BYTE	length of XAR in Logical Block Numbers
+h	DWORD	Logical Block Number of file start
+h	WORD	size of disk in logical blocks
+h	DWORD	file length in bytes
+Bh  7 BYTEs	date and time
+h	BYTE	bit flags
+h	BYTE	interleave size
+h	BYTE	interleave skip factor
+h	WORD	volume set sequence number
+h	BYTE	length of file name
+h 38 BYTEs	ASCIZ filename
+Eh	WORD	file version number
+h	BYTE	number of bytes of system use data
+h 220 BYTEs	system use data
+----------2F1510-----------------------------
+INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST
+	AX = 1510h
+	CX = CD-ROM drive letter (0 = A, 1 = B, etc)
+	ES:BX -> CD-ROM device driver request header (see AX=0802h)
+----------2F1600-----------------------------
+INT 2F - MS WINDOWS - WINDOWS ENHANCED MODE INSTALLATION CHECK
+	AX = 1600h
+Return: AL = 00h if Windows 3.x enhanced mode or Windows/386 2.x not running
+	AL = 80h if Windows 3.x enhanced mode or Windows/386 2.x not running
+	AL = 01h if Windows/386 2.x running
+	AL = FFh if Windows/386 2.x running
+	AL = anything else
+	    AL = Windows major version number >= 3
+	    AH = Windows minor version number
+Note:	INT 2F/AH=16h comprises an API for non-Windows programs (DOS device
+	  drivers, TSRs, and applications) to cooperate with multitasking
+	  Windows/386 2.x and Windows 3.x and higher enhanced mode.
+	certain calls are also supported in the Microsoft 80286 DOS extender in
+	  Windows standard mode
+SeeAlso: AX=4680h
+----------2F1602-----------------------------
+INT 2F - MS WINDOWS/386 2.x - GET API ENTRY POINT
+	AX = 1602h
+Return: ES:DI -> Windows/386 2.x API procedure entry point
+Notes:	this interface is supported in Windows 3.x only for 2.x compatibility
+	to get the current virtual machine (VM) ID in Windows/386 2.x:
+	    AX = 0000h
+	    ES:DI -> return address
+	    JUMP to address returned from INT 2F/AX=1602h
+	After JUMP, at return address:
+	    BX = current VM ID.
+SeeAlso: AX=0C20h
+----------2F1603-----------------------------
+INT 2F - RM Nimbus MSDOS 3.3 - ???
+	AX = 1603h
+Return: AX = 5248h ('RH')
+	DS:SI -> first byte after INT 2F handler in IBMBIO.COM
+----------2F1605-----------------------------
+INT 2F - MS WINDOWS - WINDOWS ENH MODE & 286 DOSX INIT BROADCAST
+	AX = 1605h
+	ES:BX = 0000h:0000h
+	DS:SI = 0000h:0000h
+	CX = 0000h
+	DX = flags
+	    bit 0 = 0 if Windows enhanced-mode initialization
+	    bit 0 = 1 if Microsoft 286 DOS extender initialization
+	    bits 1-15 reserved (undefined)
+	DI = version number (major in upper byte, minor in lower)
+Return: CX = 0000h if okay for Windows to load
+	CX <> 0 if Windows should not load
+	ES:BX -> startup info structure (see below)
+	DS:SI -> virtual86 mode enable/disable callback or 0000h:0000h
+Notes:	the Windows enhanced mode loader and Microsoft 286 DOS extender will
+	  broadcast an INT 2F/AX=1605h call when initializing.	Any DOS device
+	  driver or TSR can watch for this broadcast and return the appropriate
+	  values.  If the driver or TSR returns CX <> 0, it is also its
+	  responsibility to display an error message.
+	each handler must first chain to the prior INT 2F handler with
+	  registers unchanged before processing the call
+	if the handler requires local data on a per-VM basis, it must store the
+	  returned ES:BX in the "next" field of a startup info structure and
+	  return a pointer to that structure in ES:BX
+	a single TSR may set the V86 mode enable/disable callback; if DS:SI is
+	  already nonzero, the TSR must fail the initialization by setting CX
+	  nonzero
+SeeAlso: AX=1606h,AX=1608h,AX=4B05h
+Format of Startup Information Structure:
+Offset	Size	Description
+h  2 BYTEs	major, minor version of info structure
+h	DWORD	pointer to next startup info structure or 0000h:0000h
+h	DWORD	pointer to ASCIZ name of virtual device file or 0000h:0000h
+Ah	DWORD	virtual device reference data (only used if above nonzero)
+Eh	DWORD	pointer to instance data records or 0000h:0000h
+Format of one Instance Item in array:
+Offset	Size	Description
+h	DWORD	address of instance data (end of array if 0000h:0000h)
+h	WORD	size of instance data
+Virtual mode enable/disable procedure called with:
+	AX = 0000h disable V86 mode
+	AX = 0001h enable V86 mode
+	interrupts disabled
+Return: CF set on error
+	CF clear if successful
+	interrupts disabled
+----------2F1606-----------------------------
+INT 2F - MS WINDOWS - WINDOWS ENH MODE & 286 DOSX EXIT BROADCAST
+	AX = 1606h
+	DX = flags
+	    bit 0 = 0 if Windows enhanced-mode exit
+	    bit 0 = 1 if Microsoft 286 DOS extender exit
+	    bits 1-15 reserved (undefined)
+Notes:	if the init broadcast fails (AX=1605h returned CX <> 0), then this
+	  broadcast will be issued immediately.
+	this call will be issued in real mode
+SeeAlso: AX=1605h,AX=1609h
+----------2F1607-----------------------------
+INT 2F - MS WINDOWS - VIRTUAL DEVICE CALL OUT API
+	AX = 1607h
+	BX = virtual device ID (see INT 2F/AX=1684h)
+Notes:	more of a convention than an API, this call specifies a standard
+	  mechanism for Windows enhanced-mode virtual devices (VxD's) to talk
+	  to DOS device drivers and TSRs
+	VNETBIOS calls this function and then checks ES:DI to determine whether
+	  the NetBIOS has any extensions Windows should know about
+	VMD (Virtual Mouse Driver) calls this and then checks whether CX is
+	  nonzero; if yes, it will not automatically virtualize the mouse
+	  driver.  This would be used if MOUSE.COM already virtualizes
+	  itself using the Windows API.
+SeeAlso: AX=0C20h,AX=1605h,AX=1684h
+----------2F1607BX0015-----------------------
+INT 2F - DOS 5.0 kernel - "DOSMGR" VIRTUAL DEVICE SUPPORT
+	AX = 1607h
+	BX = 0015h (VxD identifier of "DOSMGR")
+	CX = function
+h ???
+	    	Return: CX = 0001h
+			ES:BX -> ??? data
+h ???
+	    	DX = ???
+		Return: AX = B97Ch
+			BX = value of DX on call
+			DX = A2ABh
+h NOP
+h ???
+	    	DX = ??? (bit 0 significant)
+		Return: if DX bit 0 set:
+				AX = B97Ch
+				CX = ??? (0058h)
+				DX = A2ABh
+			if DX bit 0 clear:
+				all registers preserved
+h ???
+	    	Return: DX = 0000h
+h get device driver size
+	    	ES = segment of device driver
+		Return: DX:AX = 0000h:0000h on error (not dev. driver segment)
+			DX:AX = A2ABh:B97Ch if successful
+			    BX:CX = size of device driver in bytes
+----------2F1608-----------------------------
+INT 2F - MS WINDOWS - WINDOWS ENHANCED MODE INIT COMPLETE BROADCAST
+	AX = 1608h
+Notes:	called after all installable devices have been initialized
+	real-mode software may be called between the Windows enhanced-mode init
+	  call (AX=1605h) and this call; the software must detect this
+	  situation
+SeeAlso: AX=1605h,AX=1609h
+----------2F1609-----------------------------
+INT 2F - MS WINDOWS - WINDOWS ENHANCED MODE BEGIN EXIT BROADCAST
+	AX = 1609h
+Note:	called at the beginning of a normal exit sequence; not made in the
+	  event of a fatal system crash
+SeeAlso: AX=1606h,AX=1608h
+----------2F160A-----------------------------
+INT 2F - MS Windows 3.1 - IDENTIFY WINDOWS VERSION AND TYPE
+	AX = 160Ah
+	???
+Return: ???
+----------2F160B-----------------------------
+INT 2F - MS Windows 3.1 - IDENTIFY TSRs
+	AX = 160Bh
+	???
+Return: ???
+Format of TSR-to-Windows communication structure:
+Offset	Size	Description
+h	DWORD	pointer to next structure
+h	WORD	PSP segment
+h	WORD	API version ID (0100h)
+h	WORD	EXEC flags
+ 		bit 0: "WINEXEC"
+		bit 1: "LOADLIBRARY"
+		bit 2: "OPENDRIVER"
+Ah	WORD	"exec_cmd_show"
+Ch	DWORD	"exec_cmd"
+h  4 BYTEs	reserved (0)
+h	DWORD	TSR ID block
+h	DWORD	TSR data block
+----------2F160C-----------------------------
+INT 2F - MS Windows 3.1 - DETECT ROMs
+	AX = 160Ch
+	???
+Return: ???
+Note:	used by ROM Windows
+----------2F1680-----------------------------
+INT 2F - MS WINDOWS, DPMI, various - RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE
+	AX = 1680h
+Return: AL = 00h if the call is supported
+	AL = 80h (unchanged) if the call is not supported
+Notes:	programs can use this function in idle loops to enhance performance
+	  under multitaskers; this call is supported by MS Windows 3.0, DOS 5+,
+	  DPMI 1.0+, and will be supported in OS/2 2.0 for multitasking DOS
+	  applications
+	does not block the program; it just gives up the remainder of the time
+	  slice
+	should not be used by Windows-specific programs
+SeeAlso: INT 15/AX=1000h
+----------2F1681-----------------------------
+INT 2F - MS WINDOWS 3+ - BEGIN CRITICAL SECTION
+	AX = 1681h
+Notes:	used to prevent a task switch from occurring
+	should be followed by an INT 2F/AX=1682h call as soon as possible
+	nested calls are allowed, and must be followed by an appropriate number
+	  of "end critical section" calls
+	not supported in Windows/386 2.x. Get INDOS flag with INT 21/AH=34h and
+	  and increment by hand.
+SeeAlso: AX=1682h,INT 15/AX=101Bh,INT 21/AH=34h
+----------2F1682-----------------------------
+INT 2F - MS WINDOWS 3+ - END CRITICAL SECTION
+	AX = 1682h
+Notes:	not supported in Windows/386 2.x.  Get InDOS flag with INT 21/AH=34h
+	  and decrement by hand, taking care not to decrement InDOS flag
+	  through zero
+SeeAlso: AX=1681h,INT 15/AX=101Ch,INT 21/AH=34h
+----------2F1683-----------------------------
+INT 2F - MS WINDOWS 3+ - GET CURRENT VIRTUAL MACHINE ID
+	AX = 1683h
+Return: BX = current virtual machine (VM) ID
+Notes:	Windows itself currently runs in VM 1, but this can't be relied upon
+	VM IDs are reused when VMs are destroyed
+	an ID of 0 will never be returned
+SeeAlso: AX=1684h,AX=1685h,AX=168Bh
+----------2F1684-----------------------------
+INT 2F - MS WINDOWS - GET DEVICE API ENTRY POINT
+	AX = 1684h
+	BX = virtual device (VxD) ID (see below)
+	ES:DI = 0000h:0000h
+Return: ES:DI -> VxD API entry point, or 0:0 if the VxD does not support an API
+Note:	some Windows enhanced-mode virtual devices provide services that
+	  applications can access.  For example, the Virtual Display Device
+	  (VDD) provides an API used in turn by WINOLDAP.
+SeeAlso: AX=1683h
+Values for VxD ID:
+h	VMM		Virtual Machine Manager
+h	Debug
+h	VPICD		Virtual Prog. Interrupt Controller (PIC) Device
+h	VDMAD		Virtual Direct Memory Access (DMA) Device
+h	VTD		Virtual Timer Device
+h	V86MMGR		Virtual 8086 Mode Device
+h	PAGESWAP	Paging Device
+h	Parity
+h	Reboot
+Ah	VDD		Virtual Display Device (GRABBER)
+Bh	VSD		Virtual Sound Device
+Ch	VMD		Virtual Mouse Device
+Dh	VKD		Virtual Keyboard Device
+Eh	VCD		Virtual COMM Device
+Fh	VPD		Virtual Printer Device
+h	VHD		Virtual Hard Disk Device
+h	VMCPD
+h	EBIOS		Reserve EBIOS page (e.g., on PS/2)
+h	BIOSXLAT	Map ROM BIOS API between prot & V86 mode
+h	VNETBIOS	Virtual NetBIOS Device
+h	DOSMGR
+h	WINLOAD
+h	SHELL
+h	VMPoll
+h	VPROD
+Ah	DOSNET		assures network integrity across VMs
+Bh	VFD		Virtual Floppy Device
+Ch	VDD2		Secondary display adapter
+Dh	WINDEBUG
+Eh	TSRLoad		TSR instance utility
+Note:	The high bit of the VxD ID is reserved for future use. The
+	next 10 bits are the OEM # which is assigned by Microsoft. The
+	low 5 bits are the device number.
+Call VTD.386 entry point with:
+	AX = 0000h get VTD version number
+	    Return: AH = major version
+	    	    AL = minor version
+	AX = 0100h get current clock tick time
+	    Return: EDX:EAX = clock tick time in 840ns units since Windows was
+	    			started
+	AX = 0101h get current system time in milliseconds
+	    Return: EAX = time in milliseconds that Windows has been running
+	AX = 0102h get current virtual machine time
+	    Return: EAX = cumulative amount of time the virtual machine has
+	    		been active, in milliseconds
+Note:	should only be called directly when TOOLHELP.DLL TimerCount() cannot
+	  be called
+----------2F1685-----------------------------
+INT 2F - MS WINDOWS - SWITCH VMs AND CALLBACK
+	AX = 1685h
+	BX = VM ID of virtual machine to switch to
+	CX = flags
+		bit 0 wait until interrupts enabled
+		bit 1 wait until critical section unowned
+		bits 2-15 reserved (zero)
+	DX:SI = priority boost (see VMM.INC)
+	ES:DI -> FAR procedure to callback
+Return: CF set on error
+	    AX = error code
+h invalid VM ID
+h invalid priority boost
+h invalid flags
+	CF clear if successful
+	    event will be or has been called
+Notes:	some DOS devices, such as networks, need to call functions in a
+	  specific VM. This call forces the appropriate VM to be installed.
+	the callback procedure must preserve all registers and return with IRET
+SeeAlso: AX=1683h,INT 15/AX=1117h
+----------2F1686-----------------------------
+INT 2F - DOS Protected-Mode Interface - DETECT MODE
+	AX = 1686h
+Return: AX = 0000h if operating in protected mode under DPMI (INT 31 available)
+	AX nonzero if in real/V86 mode or no DPMI (INT 31 not available)
+SeeAlso: AX=1687h
+----------2F1687-----------------------------
+INT 2F - DOS Protected-Mode Interface - INSTALLATION CHECK
+	AX = 1687h
+Return: AX = 0000h if installed
+	    BX = flags
+		bit 0: 32-bit programs supported
+	    CL = processor type (02h=80286, 03h=80386, 04h=80486)
+	    DH = DPMI major version
+	    DL = two-digit DPMI minor version
+	    SI = number of paragraphs of DOS extender private data
+	    ES:DI -> DPMI mode-switch entry point
+	AX nonzero if not installed
+SeeAlso: AX=1686h
+Call mode switch entry point with:
+	AX = flags
+	    bit 0: set if 32-bit program
+	ES = real mode segment of buffer for DPMI private data (ignored if
+		SI was zero)
+Return: CF set on error
+	    program still in real mode
+	    AX = error code (DPMI 1.0+)
+h unable to allocate all necessary descriptors
+h 32-bit program specified, but 16-bit DPMI host
+	CF clear if successful
+	    CS = 16-bit selector corresponding to real-mode CS
+	    SS = selector corresponding to real-mode SS (64K limit)
+	    DS = selector corresponding to real-mode DS (64K limit)
+	    ES = selector to program's PSP (100h byte limit)
+	    FS = GS = 0
+	    high word of ESP = 0 if 32-bit program
+	    program now in protected mode
+Note:	this entry point is only called for the initial switch to protected
+	  mode
+----------2F1688-----------------------------
+INT 2F U - MS Windows 3.0, 386MAX v6.01 - GET SELECTOR TO LDT
+	AX = 1688h
+Return: AX = status??? (0000h for 386MAX)
+	BX = selector for ???
+----------2F1689-----------------------------
+INT 2F U - MS Windows 3.0+ - KERNEL IDLE CALL
+	AX = 1689h
+	???
+Return: ???
+----------2F168A-----------------------------
+INT 2F - DPMI 0.9+ - GET VENDOR-SPECIFIC API ENTRY POINT
+	AX = 168Ah
+	DS:(E)SI = selector:offset of ASCIZ vendor name
+Return: AL = status
+h successful
+	       ES:(E)DI -> extended API entry point
+Ah unsuccessful
+Notes:	the vendor name is used to determine which entry point to return; it is
+	  case-sensitive
+	available in protected mode only
+-bit applications use ESI and EDI, 16-bit applications use SI and DI
+	this call is present but not documented for DPMI 0.9
+SeeAlso: INT 31/AX=0A00h
+Vendor names:
+ "MS-DOS"	??? and 386MAX v6.00+
+ "386MAX"	386MAX v6.00+
+----------2F168B-----------------------------
+INT 2F - MS Windows 3.1 - SET FOCUS TO SPECIFIED VIRTUAL MACHINE
+	AX = 168Bh
+	???
+Return: ???
+SeeAlso: AX=1683h
+----------2F168C-----------------------------
+INT 2F - MS Windows 3.1 - RESTART COMMAND
+	AX = 168Ch
+	???
+Return: ???
+Note:	WIN.COM executes specified application
+----------2F1700-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - IDENTIFY WinOldAp VERSION
+	AX = 1700h
+Return: AX = 1700h if this version of WINOLDAP doesn't support clipboard
+	AX <> 1700h
+		AL = WINOLDAP major version
+		AH = WINOLDAP minor version
+Notes:	WinOldAp (WINOLDAP.MOD) is a Microsoft Windows extension supporting
+	  "old" (character-mode) application access to Dynamic Data Exchange,
+	  menus, and the Windows clipboard.
+	this installation check DOES NOT follow the format used by other
+	  software
+----------2F1701-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - OPEN CLIPBOARD
+	AX = 1701h
+Return:	AX <> 0	 success
+	AX = 0	 clipboard is already open
+----------2F1702-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - EMPTY CLIPBOARD
+	AX = 1702h
+Return: AX <> 0	 clipboard has been emptied
+	AX = 0	 failure
+----------2F1703-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - SET CLIPBOARD DATA
+	AX = 1703h
+	DX = clipboard format supported by WinOldAp:
+h text
+h bitmap
+h metafile picture
+h SYLK
+h DIF
+h TIFF
+h OEM text
+	ES:BX -> data (see below for formats)
+	SI:CX = size of data
+Return: AX <> 0 data copied into the Clipboard
+	AX = 0 failure
+Format of bitmap:
+Offset	Size	Description
+h	WORD	type (0000h)
+h	WORD	width of bitmap in pixels
+h	WORD	height of bitmap in pixels
+h	WORD	bytes per line
+h	BYTE	number of color planes
+h	BYTE	number of adjacent color bits in pixel
+Ah	DWORD	pointer to start of data
+Eh	WORD	width in 0.1mm units
+h	WORD	height in 0.1mm units
+h  N BYTEs	bitmap data
+Format of metafile picture:
+Offset	Size	Description
+h	WORD	mapping mode
+h	WORD	X extent
+h	WORD	Y extent
+h	WORD	picture data
+----------2F1704-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - GET CLIPBOARD DATA SIZE
+	AX = 1704h
+	DX = clipboard format supported by WinOldAp (see AX=1703h)
+Return:	 DX:AX = size of data in bytes, including any headers
+Failure: DX:AX = 0  no data in this format in the Clipboard
+----------2F1705-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - GET CLIPBOARD DATA
+	AX = 1705h
+	DX = clipboard format supported by WinOldAp (see AX=1703h)
+	ES:BX -> buffer
+Return: AX <> 0	 success
+	AX = 0	 error, or no data in this format in Clipboard
+----------2F1708-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - CloseClipboard
+	AX = 1708h
+Return: AX <> 0 success
+	AX = 0 failure
+----------2F1709-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - COMPACT CLIPBOARD
+	AX = 1709h
+	SI:CX = desired size in bytes
+Return: DX:AX = number of bytes in largest block of free memory
+Note:	WinOldAp is responsible for including the size of any headers
+----------2F170A-----------------------------
+INT 2F - MS WINDOWS "WINOLDAP" - GET DEVICE CAPABILITIES
+	AX = 170Ah
+	DX = GDI information index
+h device driver version
+h device classification
+h width in mm
+h height in mm
+h width in pixels
+Ah height in pixels
+Ch bits per pixel
+Eh number of bit planes
+h number of brushes supported by device
+h number of pens supported by device
+h number of markers supported by device
+h number of fonts supported by device
+h number of colors
+Ah size required for device descriptor
+Ch curve capabilities
+Eh line capabilities
+h polygon capabilities
+h text capabilities
+h clipping capabilities
+h bitblt capabilities
+h X aspect
+Ah Y aspect
+Ch length of hypotenuse of aspect
+h logical pixels per inch of width
+Ah logical pixels per inch of height
+Return:	 AX = integer value of the desired item
+		device classification
+h vector plotter
+h raster display
+h raster printer
+h raster camera
+h character-stream, PLP
+h Metafile, VDM
+h display-file
+		curve capabilities
+		    bit 0  circles
+		    bit 1  pie wedges
+		    bit 2  chord arcs
+		    bit 3  ellipses
+		    bit 4  wide lines
+		    bit 5  styled lines
+		    bit 6  wide styled lines
+		    bit 7  interiors
+		line capabilities
+		    bit 1  polylines
+		    bit 2  markers
+		    bit 3  polymarkers
+		    bit 4  wide lines
+		    bit 5  styled lines
+		    bit 6  wide styled lines
+		    bit 7  interiors
+		polygon capabilities
+		    bit 0  polygons
+		    bit 1  rectangles
+		    bit 2  trapezoids
+		    bit 3  scanlines
+		    bit 4  wide borders
+		    bit 5  styled borders
+		    bit 6  wide styled borders
+		    bit 7  interiors
+		text capabilities
+		    bit 0  output precision character
+		    bit 1  output precision stroke
+		    bit 2  clippping precision stroke
+		    bit 3  90-degree character rotation
+		    bit 4  arbitrary character rotation
+		    bit 5  independent X and Y scaling
+		    bit 6  double-size
+		    bit 7  integer scaling
+		    bit 8  continuous scaling
+		    bit 9  bold
+		    bit 10 italic
+		    bit 11 underline
+		    bit 12 strikeout
+		    bit 13 raster fonts
+		    bit 14 vector fonts
+		    bit 15 reserved
+		clipping capabilities
+h none
+h clipping to rectangles
+		raster capabilities
+		    bit 0  simple bitBLT
+		    bit 1  device requires banding support
+		    bit 2  device requires scaling support
+		    bit 3  supports >64K bitmap
+Note:  This function returns the device-capability bits for the given display
+----------2F1900-----------------------------
+INT 2F U - DOS 4.x only SHELLB.COM - INSTALLATION CHECK
+	AX = 1900h
+Return: AL = 00h  not installed
+	     FFh  installed
+----------2F1901BL00-------------------------
+INT 2F U - DOS 4.x only SHELLB.COM - SHELLC.EXE INTERFACE
+	AX = 1901h
+	BL = 00h if SHELLC transient
+h if SHELLC resident
+	DS:DX -> far call entry point for resident SHELLC.EXE
+Return: ES:DI -> SHELLC.EXE workspace within SHELLB.COM
+Note:	SHELLB.COM and SHELLC.EXE are parts of the DOS 4.x shell
+----------2F1902-----------------------------
+INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM INTERFACE
+	AX = 1902h
+	ES:DI -> ASCIZ full filename of current batch file, with at least the
+		 final filename element uppercased
+	DS:DX -> buffer for results
+Return: AL = 00h  failed, either
+		  (a) final filename element quoted at ES:DI does not match
+		      identity of shell batch file quoted as parameter of most
+		      recent call of SHELLB command, or
+		  (b) no more Program Start Commands available.
+	AL= FFh	 success, then:
+		memory at DS:[DX+1] onwards filled as:
+		DX+1:	BYTE	count of bytes of PSC
+		DX+2: N BYTEs	Program Start Command text
+			BYTE	0Dh terminator
+Explanation: COMMAND.COM executes the result of this call in preference to
+	reading a command from a batch file. Thus the batch file does not
+	advance in execution for so long as SHELLB provides PSCs from its
+	workspace. The PSCs are planted in SHELLB workspace by SHELLC, the user
+	menu interface. The final PSC of a sequence is finished with a
+	GOTO COMMON, which causes a loop back in the batch file which called
+	SHELLC so as to execute SHELLC again. The check on batch file name
+	permits PSCs to CALL nested batch files while PSCs are still stacked
+	up for subsequent execution.
+----------2F1903-----------------------------
+INT 2F U - DOS 4.x only SHELLB.COM - COMMAND.COM interface
+	AX = 1903h
+	ES:DI -> ASCIZ batch file name as for AX=1902h
+Return: AL = FFh if quoted batch file name matches last SHELLB parameter
+	AL = 00h if it does not
+----------2F1904-----------------------------
+INT 2F U - DOS 4.x only SHELLB.COM - SHELLB transient to TSR intrface
+	AX = 1904h
+Return: ES:DI -> name of current shell batch file:
+		WORD	number of bytes of name following
+		BYTEs	(8 max) uppercase name of shell batch file
+----------2F1A00-----------------------------
+INT 2F - DOS 4+ ANSI.SYS - INSTALLATION CHECK
+	AX = 1A00h
+Return: AL = FFh if installed
+Notes:	AVATAR.SYS also responds to this call
+	documented for DOS 5+, but undocumented for DOS 4.x
+----------2F1A00BX4156-----------------------
+INT 2F - AVATAR.SYS - INSTALLATION CHECK
+	AX = 1A00h
+	BX = 4156h ('AV')
+	CX = 4154h ('AT')
+	DX = 4152h ('AR')
+Return: AL = FFh if installed
+	    CF clear
+	    BX = AVATAR protocol level supported
+	    CX = driver type
+h AVATAR.SYS
+h DVAVATAR.COM inside DESQview window
+	    DX = 0016h
+Notes:	AVATAR also identifies itself as ANSI.SYS if BX, CX, or DX differ from
+	  the magic values
+	AVATAR.SYS is a CON replacement by George Adam Stanislav which
+	  interprets AVATAR command codes in the same way that ANSI interprets
+	  ANSI command codes
+----------2F1A01-----------------------------
+INT 2F U - DOS 4+ ANSI.SYS internal - GET/SET DISPLAY INFORMATION
+	AX = 1A01h
+	CL = function
+Fh for GET
+Fh for SET
+	DS:DX -> parm block as for INT 21,AX=440Ch,CX=037Fh/035Fh respectively
+Return: CF set on error
+	    AX = error code (many non-standard)
+	CF clear if successful
+	    AX destroyed
+Note:	presumably this is the DOS IOCTL interface to ANSI.SYS
+SeeAlso: AX=1A02h,INT 21/AX=440Ch
+----------2F1A02-----------------------------
+INT 2F U - DOS 4+ ANSI.SYS internal - MISCELLANEOUS REQUESTS
+	AX = 1A02h
+	DS:DX -> parameter block (see below)
+Note:	DOS 5.0 chains to previous handler if AL > 02h on call
+SeeAlso: AX=1A01h
+Format of parameter block:
+Offset	Size	Description
+h	BYTE	subfunction
+h set/reset interlock
+h get /L flag
+h	BYTE	interlock state
+h=reset, 01h=set
+		  This interlock prevents some of the ANSI.SYS post-processing
+		  in its hook onto INT 10, AH=00h mode set
+h	BYTE	(returned)
+h if /L not in effect
+h if /L in effect
+----------2F1A21-----------------------------
+INT 2F - AVATAR.SYS - SET DRIVER STATE
+	AX = 1A21h (AL='!')
+	DS:SI -> command string with one or more state characters
+	CX = length of command string
+Return: CF set on error (invalid subfunction)
+	CF clear if successful
+Note:	the characters in the state string are interpreted left to right, and
+	  need not be in any particular order
+SeeAlso: AX=1A3Fh
+Values of state characters:
+ 'a'	activate driver
+ 'd'	disable driver
+ 'f'	use fast screen output
+ 'g'	always convert gray keys (+ and -) to function keys
+ 'G'	never convert gray keys
+ 'l'	convert gray keys only when ScrollLock active
+ 's'	use slow screen output
+ 't'	Tandy 1000 keyboard (not yet implemented)
+----------2F1A3C-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1A3Ch
+	???
+Return: CX = 0000h
+----------2F1A3E-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1A3Eh
+	CL = ???
+	CH = ???
+	DL = ???
+	DH = ???
+Return: CL = ???
+	CH = ???
+	DL = ???
+	DH = ???
+----------2F1A3F-----------------------------
+INT 2F - AVATAR.SYS - QUERY DRIVER STATE
+	AX = 1A3Fh (AL='?')
+	ES:DI -> buffer
+	CX = length of buffer in bytes
+Return: CF clear
+	CX = actual size of returned info
+Note:	the returned information consists of multiple letters whose meanings
+	  are described under AX=1A21h
+SeeAlso: AX=1A21h
+----------2F1A42BX4156-----------------------
+INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ3 HANDLER
+	AX = 1A42h
+	BX = 4156h ('AV')
+	ES:DI -> FAR handler for serial port using IRQ3
+	DS = data segment needed by handler
+Return: AX = 1A42h if ASD not installed
+	   = 0000h if no more room
+	   else handle to use when uninstalling
+Notes:	the handler need not save/restore registers or signal EOI to the
+	  interrupt controller
+	the handler should return AX=0000h if the interrupt was meant for it,
+	  and either leave AX unchanged or return a non-zero value otherwise
+	the most recently installed handler will be called first, continuing
+	  to earlier handlers until one returns AX=0000h
+SeeAlso: AX=1A43h,AX=1A62h
+----------2F1A43BX4156-----------------------
+INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ4 HANDLER
+	AX = 1A43h
+	BX = 4156h ('AV')
+	ES:DI -> FAR handler for serial port using IRQ4
+	DS = data segment needed by handler
+Return: AX = 1A43h if ASD not installed
+	   = 0000h if no more room
+	   else handle to use when uninstalling
+Notes:	(see AX=1A42h)
+SeeAlso: AX=1A42h,AX=1A63h
+----------2F1A44BX4156-----------------------
+INT 2F - AVATAR.SYS v0.11+ - GET DATA SEGMENT
+	AX = 1A44h
+	BX = 4156h ('AV')
+Return: AX = 0000h
+	DS = data segment
+	CX = size of data segment
+Note:	AVATAR.SYS calls this function whenever it is invoked.	If each
+	  process under a multitasker hooks this function and provides a
+	  separate data segment, AVATAR.SYS becomes fully reentrant.
+SeeAlso: AX=1A21h,AX=1A3Fh
+----------2F1A52-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - GET ???
+	AX = 1A52h
+	CX = size of buffer
+	ES:DI -> buffer
+Return: ??? copied into user buffer
+Note:	the maximum size of the data which may be copied is returned by
+	  AX=1A72h
+SeeAlso: AX=1A72h
+----------2F1A53-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1A53h
+	CL = ??? (00h-05h)
+	???
+Return: ???
+----------2F1A62BX4156-----------------------
+INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ3 HANDLER
+	AX = 1A62h
+	BX = 4156h ('AV')
+	CX = handle for IRQ routine returned by AX=1A42h
+SeeAlso: AX=1A42h,AX=1A63h
+----------2F1A63BX4156-----------------------
+INT 2F - AVATAR Serial Dispatcher - UNINSTALL IRQ4 HANDLER
+	AX = 1A63h
+	BX = 4156h ('AV')
+	CX = handle for IRQ routine returned by AX=1A43h
+SeeAlso: AX=1A43h,AX=1A62h
+----------2F1A72-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - GET ??? SIZE
+	AX = 1A72h
+Return: CX = maximum size of ???
+SeeAlso: AX=1A52h
+----------2F1A7B-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1A7Bh
+Return: AX = 0000h
+	CX = 0000h
+----------2F1A7D-----------------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1A7Dh
+Return: AX = ???
+----------2F1AADDX0000-----------------------
+INT 2F U - AVATAR.SYS v0.11 - ???
+	AX = 1AADh
+	DX = 0000h
+	CX = subfunction (00h-0Ch)
+	???
+Return: AX = 0000h if DX was nonzero
+	???
+----------2F1B00-----------------------------
+INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - INSTALLATION CHECK
+	AX = 1B00h
+Return: AL = FFh if installed
+Note:	XMA2EMS.SYS extension is only installed if DOS has page frames to hide.
+	This extension hooks onto INT 67/AH=58h and returns from that call data
+	  which excludes the physical pages being used by DOS.
+SeeAlso: AH=1Bh"FRAME INFO"
+----------2F1B-------------------------------
+INT 2F U - DOS 4+ XMA2EMS.SYS extension internal - GET HIDDEN FRAME INFORMATION
+	AH = 1Bh
+	AL <> 00h
+	DI = hidden physical page number
+Return: AX = FFFFh if failed (no such hidden page)
+	AX = 0000h if OK, then
+	     ES = segment of page frame
+	     DI = physical page number
+Notes:	this corresponds to the data edited out of the INT 67/AH=58h call
+	FASTOPEN makes this call with AL = FFh
+SeeAlso: AX=1B00h
+----------2F2300-----------------------------
+INT 2F - DR-DOS 5.0 GRAFTABL - INSTALLATION CHECK
+	AX = 2300h
+Return: AH = FFh
+Note:	this installation check does not follow the usual format
+SeeAlso: AH=23h
+----------2F23-------------------------------
+INT 2F - DR-DOS 5.0 GRAFTABL - GET GRAPHICS DATA
+	AH = 23h
+	AL nonzero
+Return: AH = FFh
+	ES:BX -> graphics data
+SeeAlso: AX=2300h
+----------2F2700-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - INSTALLATION CHECK
+	AX = 2700h
+Return: AL = 00h not installed
+	   = FFh installed
+----------2F2701-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET STATUS
+	AX = 2701h
+Return: AX = maximum simultaneous tasks
+	BX = index into TASK_IDS of current foreground task
+	CX = currently-active tasks
+	DX = version number (DR-DOS 6.0 = 0001h)
+	ES:SI -> TASK_IDS
+	ES:DI -> name table (array of 8-byte names, NUL-terminated if <8 chars)
+Notes:	do not attempt to create a new task if CX == AX
+	the task's index is its position on the task menu, while its ID is the
+	  position within the internal task name table
+SeeAlso: AX=2714h,AX=2716h
+----------2F2702-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET PER-TASK EMS LIMIT
+	AX = 2702h
+Return: DX = maximum pages INT 67/AH=42h will report available
+Note:	TaskMAX does not limit EMS allocations other than by limiting the
+	  amount which is reported as being available at a given time
+SeeAlso: AX=2703h,INT 67/AH=42h
+----------2F2703-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - SET PER-TASK EMS LIMIT
+	AX = 2703h
+	DX = maximum pages INT 67/AH=42h should report available
+Return: DX = new maximum for reporting
+SeeAlso: AX=2702h,INT 67/AH=42h
+----------2F2704-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - REGISTER/UNREGISTER TASK MANAGER
+	AX = 2704h
+	DL = subfunction
+h unregister task manager
+h register task manager
+Return: DL = status
+h registered
+h unregistered
+Notes:	a task manager replaces TaskMAX's menu system with its own user
+	  interface; while one is registered, the TaskMAX hotkeys and
+	  Ctrl-Alt-Del invoke the manager rather than the built-in menu system
+	unregister the task manager before terminating it
+SeeAlso: AX=2705h
+----------2F2705-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - ENABLE/DISABLE DIRECT SWITCHING
+	AX = 2705h
+	DL = subfunction
+h disable keystrokes for switching to next/prev/specified task
+h enable
+Return: nothing
+Note:	should only be called by a registered task manager (see AX=2704h)
+SeeAlso: AX=2704h,AX=2706h
+----------2F2706-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - SWITCH TO SPECIFIED TASK
+	AX = 2706h
+	DX = task index (see AX=2701h) of task to be activated
+Return: DX = task index of previously-active task
+SeeAlso: AX=2705h,AX=2707h,AX=2715h
+----------2F2707-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - CREATE NEW TASK
+	AX = 2707h
+	DS:DX -> ASCIZ pathname of executable
+	ES:BX -> parameter block (see below)
+	CX = number of ticks before automatic return to task manager
+		(0000h = run until termination or explicitly switched)
+Return: DX = new task's task index (FFFFh if task terminated)
+SeeAlso: AX=2706h,AX=2708h
+Format of parameter block:
+Offset	Size	Description
+h	WORD	reserved, should be 0000h
+h	DWORD	pointer to command tail to be copied into child's PSP
+h	DWORD	pointer to first FCB to be copied into child's PSP
+Ah	DWORD	pointer to second FCB to be copied into child's PSP
+----------2F2708-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - DELETE TASK
+	AX = 2708h
+	DX = task index
+Return: DX = FFFFh (task deleted)
+Notes:	this call should only be used for abnormal task termination, after
+	  first checking for open files with AX=270Ch; should not be used
+	  with programs that allocate EMS or XMS memory
+	switches to specified task first
+SeeAlso: AX=2707h
+----------2F2709-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - NAME TASK
+	AX = 2709h
+	DX = task index
+	DS:SI -> 8-byte name (8 NULs = remove name)
+Return: AL = task flags
+h ID unused or task terminated
+h ID in use, task name table entry valid
+h ID in use, task name fixed
+	BX = task ID
+	ES:DI -> name in task name table (see AX=2701h)
+Note:	the task retains the given name until it terminates or the name is
+	  removed by specifying a name of 8 NULs.
+SeeAlso: AX=2701h,AX=2707h
+----------2F270A-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - CONVERT TASK INDEX TO TASK ID
+	AX = 270Ah
+	DX = task index
+Return: DX = task ID (FFFFh if index invalid)
+Note:	task IDs stay constant, while indexes can change when other tasks are
+	  deleted
+SeeAlso: AX=2701h,AX=270Bh
+----------2F270B-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - CONVERT TASK ID TO TASK INDEX
+	AX = 270Bh
+	DX = task ID
+Return: DX = task index (FFFFh if task not active)
+SeeAlso: AX=270Ah
+----------2F270C-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - CHECK OPEN FILES
+	AX = 270Ch
+	DX = task index
+Return: AX = number of files currently open for specified task
+SeeAlso: AX=2708h
+----------2F270D-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - CHECK IF TASK RUNNING PRIMARY COMMAND INTERPRETER
+	AX = 270Dh
+	DX = task index
+Return: DX = status
+h if primary command interpreter (COMMAND.COM, etc.) running
+h if not in root shell for task
+Note:	TaskMAX will return 0001h if the specified task has spawned another
+	  command interpreter with AX=2707h
+SeeAlso: AX=2707h,AX=270Ch
+----------2F270E-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET/SET TEXT PASTE LEAD-IN
+	AX = 270Eh
+	CX = length of string (max 15 keystrokes, 0000h to get current string)
+	DS:SI -> pasting lead-in string (character/scan-code pairs)
+Return: ES:DI -> current lead-in string
+Note:	the specified sequence of keystrokes is sent to the application before
+	  every line of a text-mode spreadsheet paste
+SeeAlso: AX=270Fh,AX=2710h,AX=2713h
+----------2F270F-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE LEAD-IN
+	AX = 270Fh
+	CX = length of string (max 15 keystrokes, 0000h to get current string)
+	DS:SI -> pasting lead-in string (character/scan-code pairs)
+Return: ES:DI -> current lead-in string
+Note:	the specified sequence of keystrokes is sent to the application before
+	  every number in a numeric-mode spreadsheet paste
+SeeAlso: AX=270Eh,AX=2710h,AX=2711h,AX=2713h
+----------2F2710-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET/SET PASTE LINE TERMINATOR STRING
+	AX = 2710h
+	CX = length of string (max 15 keystrokes, 0000h to get current string)
+	DS:SI -> pasting lead-in string (character/scan-code pairs)
+Return: ES:DI -> current lead-in string
+Note:	the specified sequence of keystrokes is sent to the application after
+	  every line of a spreadsheet paste operation
+SeeAlso: AX=270Eh,AX=270Fh,AX=2713h
+----------2F2711-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET/SET NUMERIC PASTE DECIMAL POINT
+	AX = 2711h
+	DX = ASCII code for separator (FFFFh to get current)
+Return: DL = current separator character
+SeeAlso: AX=270Fh
+----------2F2712-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - INITIATE EXPORTING TASK DATA
+	AX = 2712h
+	DX = task index
+----------2F2713-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - INITIATE PASTE OPERATION
+	AX = 2713h
+	DX = task index
+	CX = past mode
+h alphanumeric
+h numeric
+h text
+SeeAlso: AX=270Eh,AX=270Fh,AX=2710h,AX=2711h
+----------2F2714-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET SWAP SPACE INFO
+	AX = 2714h
+Return: CX = total KB of swap space
+	DX = available KB of swap space
+SeeAlso: AX=2701h
+----------2F2715-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - SWITCH TO TASK MANAGER
+	AX = 2715h
+Return: only after calling task is again selected
+SeeAlso: AX=2706h
+----------2F2716-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - GET PASTE BUFFER STATUS
+	AX = 2716h
+Return: AX = 0000h if AX=2716h,AX=2717h,AX=2718h supported
+	    CX = bytes in paste buffer
+	    DX = current generation number (updated after every copy operation)
+SeeAlso: AX=2701h,AX=2713h,AX=2714h,AX=2717h,AX=2718h
+----------2F2717-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - PASTE DATA DIRECTLY TO APPLICATION BUFFER
+	AX = 2717h
+	CX = bytes in destination buffer
+	ES:DI -> destination buffer
+Return: AX = 0000h if function supported
+	    CX = bytes actually copied (FFFFh if buffer too small)
+	    DX = current generation number for paste buffer
+Note:	the destination buffer may be too small if another task adds more data
+	  to the paste buffer after the AX=2716h call but before this call
+SeeAlso: AX=2713h,AX=2716h,AX=2718h
+----------2F2718-----------------------------
+INT 2F - DR-DOS 6.0 TaskMAX - COPY DATA DIRECTLY INTO PASTE BUFFER
+	AX = 2718h
+	CX = bytes in source buffer
+	DS:SI -> source buffer (plain ASCII, lines terminated with CR LF)
+Return: AX = 0000h if function supported
+	    CX = bytes actually copied
+	    DX = current generation number for paste buffer
+SeeAlso: AX=2712h,AX=2716h,AX=2717h
+----------2F2A-------------------------------
+INT 2F - Gammafax DOS Dispatcher INTERFACE
+	AH = 2Ah
+Note:	details not available at this time
+SeeAlso: AX=8000h"FaxBIOS",AX=CB00h,AX=CBDDh,INT 66"BitFax"
+----------2F3900-----------------------------
+INT 2F - Kingswood TSR INTERFACE - COMPATIBILITY MODE
+	AX = 3900h
+Return: AL = status
+h not installed
+	    FFh one or more TSRs using this interface is installed
+Note:	this function is provided to that the multiplex number will appear used
+	  to other programs
+SeeAlso: AH=39h/BL=00h
+----------2F39--BL00-------------------------
+INT 2F - Kingswood TSR INTERFACE - INSTALLATION CHECK
+	AH = 39h
+	BL = 00h
+	AL = TSR ID number (01h-FFh, currently only 01h-0Eh used) (see below)
+Return: AL = status
+h not installed
+	    FFh installed
+		DX = segment address of resident module
+Note:	All of Kingswood Software's TSRs use this interface.  Usually the
+	  resident module is installed by allocating a block of upper memory,
+	  setting its owner ID to 0008h (DOS data), and filling the MCB name
+	  field with the TSR's name.
+SeeAlso: AX=3900h,AH=39h/BL=01h
+Values for TSR ID number:
+h TSR Windows
+h NOBUSY
+h CD STACK
+h DISK WATCH
+h PUSHBP
+h ALIAS
+h KEYMACRO
+h SLOWDOWN
+h ANSIGRAB
+Ah TEE
+Bh FASTMOUS
+Ch EXTWILD
+Dh BREAKOUT
+Eh STOPDISK
+Format of TSR modules:
+Offset	Size	Description
+h  4 BYTEs	signature "FTSR"
+h	WORD	segment address of this module
+h	WORD	number of words to skip (usually 0000h if no PSP present)
+h  N WORDs	module-defined data that must be at a fixed segment offset
+		(usually only a PSP if file access is required)
+N BYTEs	interrupt list (see below)
+	BYTE	FFh terminator
+Format of interrupt list entry:
+Offset	Size	Description
+h	BYTE	interrupt number (00h-FEh)
+h	WORD	offset within segment of DWORD pointer to previous interrupt
+h	WORD	offset within segment of begin of interrupt handler code
+----------2F39--BL01-------------------------
+INT 2F - Kingswood TSR INTERFACE - REMOVAL CHECK
+	AH = 39h
+	BL = 01h
+	AL = TSR ID number (01h-FFh) (see AH=39h/BL=00h)
+Return: AL = status
+h not ready to be removed
+	    FFh resident module may be removed by deassigning the interrupts
+		hooked by the TSR and deallocating the TSR's memory block
+	AH,BX,CX,DX,ES may be destroyed
+SeeAlso: AX=3900h,AH=39h/BL=00h
+----------2F39-------------------------------
+INT 2F - Kingswood TSR INTERFACE - APPLICATION-SPECIFIC FUNCTION CALLS
+	AH = 39h
+	BL = function number (02h-FFh)
+	AL = TSR ID number (01h-FFh)
+	CX,DX,SI,DI,DS,ES may contain parameters
+Return: as appropriate for the called function
+SeeAlso: AX=3900h,AH=39h/BL=00h,AX=3901h/BL=02h
+----------2F3901BL02-------------------------
+INT 2F - Kingswood TSR Windows - OPEN WINDOW
+	AX = 3901h
+	BL = 02h
+Return: AX = error code (0000h if successful)
+Notes:	opens the next TSR window on top of any others.	 Only three
+	  TSR windows can be opened at any one time.  The three windows
+	  are all 40x11 characters, partly overlapping.
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=03h,AX=3901h/BL=05h,AX=3901h/BL=06h
+----------2F3901BL03-------------------------
+INT 2F - Kingswood TSR Windows - HIDE WINDOWS
+	AX = 3901h
+	BL = 03h
+Return: AX = error code (0000h if successful)
+Notes:	Hide any visible TSR windows from view.
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=05h
+----------2F3901BL04-------------------------
+INT 2F - Kingswood TSR Windows - SHOW WINDOWS
+	AX = 3901h
+	BL = 04h
+Return: AX = error code (0000h if successful)
+Notes:	Re-display all TSR windows after a HIDE WINDOWS call.
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h,AX=3901h/BL=03h
+----------2F3901BL05-------------------------
+INT 2F - Kingswood TSR Windows - CLOSE WINDOW
+	AX = 3901h
+	BL = 05h
+Return: AX = error code (0000h if successful)
+Notes:	Close the last opened TSR window.
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
+----------2F3901BL06-------------------------
+INT 2F - Kingswood TSR Windows - SET WINDOW TITLE
+	AX = 3901h
+	BL = 06h
+	DS:SI -> title string
+Return: AX = error code (0000h if successful)
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
+----------2F3901BL07-------------------------
+INT 2F - Kingswood TSR Windows - POSITION CURSOR
+	AX = 3901h
+	BL = 07h
+	CH = Y coordinate (0-10)
+	CL = X coordinate (0-39)
+Return: AX = error code (0000h if successful)
+Note:	the hardware cursor is always disabled when a TSR window is opened;
+	  this call only sets a text position
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=08h,AX=3901h/BL=09h
+----------2F3901BL08-------------------------
+INT 2F - Kingswood TSR Windows - DISPLAY STRING
+	AX = 3901h
+	BL = 08h
+	DS:SI -> string
+Return: AX = error code (0000h if successful)
+Notes:	The text is not clipped.
+	This routine understands Tab, NewLine and Carriage Return
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h
+----------2F3901BL09-------------------------
+INT 2F - Kingswood TSR Windows - SCROLL WINDOW
+	AX = 3901h
+	BL = 09h
+	CL = scroll direction: 00h up, FFh down, 00h clear window
+Return: AX = error code (0000h if successful)
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=07h
+----------2F3901BL0A-------------------------
+INT 2F - Kingswood TSR Windows - SOUND BEEPER
+	AX = 3901h
+	BL = 0Ah
+	DX = sound divisor, or 0 for silence.
+	     (divide 1843200 by required frequency to get value for DX)
+	CL = sound length in 18.2 Hz clock ticks
+Return: AX = error code (0000h if successful)
+SeeAlso: AH=39h/BL=00h
+----------2F3901BL0B-------------------------
+INT 2F - Kingswood TSR Windows - ADD OR REMOVE USER
+	AX = 3901h
+	BL = 0Bh
+	CL = number of users increment: +1 if adding a new user
+					-1 if removing a user
+Return: AX = error code (0000h if successful)
+Note:	the TSR windows resident module may only be removed when the internal
+	  user count is zero
+SeeAlso: AH=39h/BL=00h,AX=3901h/BL=02h
+----------2F4000-----------------------------
+INT 2F - Windows 3.x (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABLTIES
+	AX = 4000h
+Return: AL = 01h does not virtualize video access
+h virtualizes the video when in text mode
+h virtualizes the video when in text mode or single plane
+		 graphics modes
+h virtualizes the video when in text mode, single plane
+		 graphics modes, and VGA multiplane modes
+	     FFh virtualizes the video fully
+Note:	this function is used by display drivers to find out what capabilities
+	  exist for the VDD driver and also trigger then VDD driver to call
+	  functions 4005h and 4006h.  This function also gives the Video Driver
+	  hardware access to the video registers.
+----------2F4001-----------------------------
+INT 2F - OS/2 compatibility box - SWITCHING DOS TO BACKGROUND
+	AX = 4001h
+Note:	called by OS/2 when the DOS box is about to be placed in the background
+	  and the video driver should save any necessary state
+SeeAlso: AX=4002h,AX=4005h
+----------2F4002-----------------------------
+INT 2F - OS/2 compatibility box - SWITCHING DOS TO FOREGROUND
+	AX = 4002h
+Note:	called by OS/2 when the DOS box is about to be placed in the foreground
+	  and the video driver should restore the previously-saved state
+SeeAlso: AX=4001h,AX=4006h
+----------2F4003-----------------------------
+INT 2F - Windows 3.x - ENTERING VIDEO DRIVER CRITICAL SECTION
+	AX = 4003h
+Note:	This critical section must be exited within 1 second.
+SeeAlso: AX=4004h
+----------2F4004-----------------------------
+INT 2F - Windows 3.x - EXITING VIDEO DRIVER CRITICAL SECTION
+	AX = 4004h
+SeeAlso: AX=4003h
+----------2F4005-----------------------------
+INT 2F - Windows 3.x - SWITCHING DOS TO BACKGROUND
+	AX = 4005h
+Note:	called by Windows when the DOS box is about to be placed in the
+	  background and the video driver should save any necessary state
+	  information
+SeeAlso: AX=4001h,AX=4006h
+----------2F4006-----------------------------
+INT 2F - Windows 3.x - SWITCHING DOS TO FOREGROUND
+	AX = 4006h
+Note:	called by Windows when the DOS box is about to be placed in the
+	  foreground and the video driver should restore any necessary state
+	  information
+SeeAlso: AX=4002h,AX=4005h
+----------2F4007-----------------------------
+INT 2F - Windows 3.x - ENABLE VDD TRAPPING OF VIDEO REGISTERS
+	AX = 4007h
+----------2F41-------------------------------
+INT 2F - LAN Manager 2.0 DOS Enhanced NETPOPUP.EXE - NETWORK POP-UP SERVICE
+	AH = 41h
+	???
+Return: ???
+Note:	LAN Manager enhanced mode adds features beyond the standard redirector
+	  file/printer services
+SeeAlso: AX=118Ah,AH=42h,AH=4Bh
+----------2F42-------------------------------
+INT 2F - LAN Manager 2.0 DOS Enhanced MSRV.EXE - MESSENGER SERVICE
+	AH = 42h
+	???
+Return: ???
+Note:	LAN Manager enhanced mode adds features beyond the standard redirector
+	  file/printer services
+SeeAlso: AX=118Ah,AH=41h,AH=4Bh
+----------2F4300-----------------------------
+INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) - INSTALLATION CHECK
+	AX = 4300h
+Return: AL = 80h XMS driver installed
+	AL <> 80h no driver
+Notes:	XMS gives access to extended memory and noncontiguous/nonEMS memory
+	  above 640K
+	this installation check DOES NOT follow the format used by other
+	  software
+SeeAlso: AX=4310h
+----------2F4310-----------------------------
+INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) - GET DRIVER ADDRESS
+	AX = 4310h
+Return: ES:BX -> driver entry point
+Note:	HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h
+SeeAlso: AX=4300h
+Perform a FAR call to the driver entry point with AH set to the function code
+	AH	function
+h  Get XMS version number
+	     Return: AX = XMS version (in BCD, AH=major, AL=minor)
+		     BX = internal revision number
+		     DX = 0001h if HMA (1M to 1M + 64K) exists
+h if HMA does not exist
+h  Request High Memory Area (1M to 1M + 64K)
+	     DX = memory in bytes (for TSR or device drivers)
+		  FFFFh if application program
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,90h,91h,92h) (see below)
+h  Release High Memory Area
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,90h,93h) (see below)
+h  Global enable A20, for using the HMA
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,82h) (see below)
+h  Global disable A20
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,82h,94h) (see below)
+h  Local enable A20, for direct access to extended memory
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,82h) (see below)
+h  Local disable A20
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,82h,94h) (see below)
+h  Query A20 state
+	     Return: AX = 0001h enabled
+			= 0000h disabled
+		     BL = error code (00h,80h,81h) (see below)
+h  Query free extended memory, not counting HMA
+	     BL = 00h (some implementations leave BL unchanged on success)
+	     Return: AX = size of largest extended memory block in K
+		     DX = total extended memory in K
+		     BL = error code (00h,80h,81h,A0h) (see below)
+h  Allocate extended memory block
+	     DX = Kbytes needed
+	     Return: AX = 0001h success
+			   DX = handle for memory block
+			= 0000h failure
+			   BL = error code (80h,81h,A0h) (see below)
+Ah  Free extended memory block
+	     DX = handle of block to free
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,A2h,ABh) (see below)
+Bh  Move extended memory block
+	     DS:SI -> EMM structure (see below)
+	     Note: if either handle is 0000h, the corresponding offset is
+		   considered to be an absolute segment:offset address in
+		   directly addressable memory
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h-82h,A3h-A9h) (see below)
+Ch  Lock extended memory block
+	     DX = handle of block to lock
+	     Return: AX = 0001h success
+			   DX:BX = 32-bit linear address of locked block
+			= 0000h failure
+			   BL = error code (80h,81h,A2h,ACh,ADh) (see below)
+Dh  Unlock extended memory block
+	     DX = handle of block to unlock
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,A2h,AAh) (see below)
+Eh  Get handle information
+	     DX = handle for which to get info
+	     Return: AX = 0001h success
+			   BH = block's lock count
+			   BL = number of free handles left
+			   DX = block size in K
+			= 0000h failure
+			   BL = error code (80h,81h,A2h) (see below)
+Fh  Reallocate extended memory block
+	     DX = handle of block
+	     BX = new size of block in K
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,81h,A0h-A2h,ABh) (see below)
+h  Request upper memory block (nonEMS memory above 640K)
+	     DX = size of block in paragraphs
+	     Return: AX = 0001h success
+			   BX = segment address of UMB
+			   DX = actual size of block
+			= 0000h failure
+			   BL = error code (80h,B0h,B1h) (see below)
+			   DX = largest available block
+h  Release upper memory block
+	     DX = segment address of UMB to release
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,B2h) (see below)
+h  (XMS v3.0) Reallocate upper memory block
+	     DX = segment address of UMB to resize
+	     BX = new size of block in paragraphs
+	     Return: AX = 0001h success
+			= 0000h failure
+			   BL = error code (80h,B0h,B2h) (see below)
+h  (QEMM 5.11 only, undocumented) ???
+h  (QEMM 5.11 only, undocumented) ???
+h  (XMS v3.0) Query free extended memory
+	     Return: EAX = largest block of extended memory, in K
+		     BL = status
+h success
+h not implemented (i.e. on a 286 system)
+h VDISK detected
+			 A0h all extended memory allocated
+	     	     ECX = physical address of highest byte of memory
+		     		(valid even on error codes 81h and A0h)
+		     EDX = total Kbytes of extended memory (0 if status A0h)
+h  (XMS v3.0) Allocate any extended memory
+	     EDX = Kbytes needed
+	     Return: AX = 0001h success
+	     		    DX = handle for allocated block (free with AH=0Ah)
+			= 0000h failure
+			    BL = status (80h,81h,A0h,A1h,A2h) (see below)
+Eh  (XMS v3.0) Get extended EMB handle information
+	     DX = handle
+	     Return: AX = 0001h success
+	     		    BH = block's lock count
+			    CX = number of free handles left
+			    EDX = block size in K
+	     		= 0000h failure
+	     		    BL = status (80h,81h,A2h) (see below)
+Fh  (XMS v3.0) Reallocate any extended memory block
+	     DX = unlocked handle
+	     EBX = new size in K
+	     Return: AX = 0001h success
+	     		= 0000h failure
+			    BL = status (80h,81h,A0h-A2h,ABh) (see below)
+Notes:	HIMEM.SYS requires at least 256 bytes free stack space
+	the XMS driver need not implement functions 10h through 12h to be
+	  considered compliant with the standard
+Format of EMM structure:
+Offset	Size	Description
+h	DWORD	number of bytes to move (must be even)
+h	WORD	source handle
+h	DWORD	offset into source block
+Ah	WORD	destination handle
+Ch	DWORD	offset into destination block
+Notes:	if source and destination overlap, only forward moves (source base
+	  less than destination base) are guaranteed to work properly
+	if either handle is zero, the corresponding offset is interpreted
+	  as a real-mode address referring to memory directly addressable
+	  by the processor
+Error codes returned in BL:
+h successful
+h function not implemented
+h Vdisk was detected
+h an A20 error occurred
+Eh a general driver error
+Fh unrecoverable driver error
+h HMA does not exist
+h HMA is already in use
+h DX is less than the /HMAMIN= parameter
+h HMA is not allocated
+h A20 line still enabled
+	A0h all extended memory is allocated
+	A1h all available extended memory handles are allocated
+	A2h invalid handle
+	A3h source handle is invalid
+	A4h source offset is invalid
+	A5h destination handle is invalid
+	A6h destination offset is invalid
+	A7h length is invalid
+	A8h move has an invalid overlap
+	A9h parity error occurred
+	AAh block is not locked
+	ABh block is locked
+	ACh block lock count overflowed
+	ADh lock failed
+	B0h only a smaller UMB is available
+	B1h no UMB's are available
+	B2h UMB segment number is invalid
+----------2F44-------------------------------
+INT 2F U - ???
+	AH = 44h
+	AL = function (at least 0Bh, 15h, 17h)
+	???
+Return: ???
+Note:	called by Codeview for Windows
+SeeAlso: AH=86h
+----------2F4500-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - INSTALLATION CHECK
+	AX = 4500h
+Return: AL = 01h if PROF.COM installed
+	AL = 02h if VPROD.386 installed
+SeeAlso: AX=4501h,AX=4502h
+----------2F4501-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SETUP PROFILER
+	AX = 4501h
+	BX = CSIPS buffer size in KB (first parameter for ProfSetup)
+	CX = output limit in KB (second parameter for ProfSetup)
+Note:	this call is not supported by PROF.COM
+SeeAlso: AX=4502h,AX=4503h
+----------2F4502-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SET SAMPLING RATE
+	AX = 4502h
+	BL = sampling rate for PROF.COM (0 < BL <= 13)
+	    (01h = 8192/s, 04h = 1024/s, 08h = 32/s, 0Dh = 1/s)
+	CX = sampling rate for VPROD.386
+Note:	for PROF.COM, this programs the CMOS clock by setting BL+2 as the
+	  low four bits of CMOS register 0Ah.  The interruption rate is
+SHL (15 - BL) per second.
+SeeAlso: AX=4501h,AX=4503h
+----------2F4503-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - START PROFILING
+	AX = 4503h
+Notes:	Profiling is also turned on by the key combinations
+	  LeftShift + RightShift + Alt
+	  LeftShift + RightShift + Ctrl
+	for PROF.COM, this call programs the CMOS clock by reading register
+Ch, and setting bit 6 of register 0Bh.  It then makes sure that IRQ8
+	  is unmasked
+SeeAlso: AX=4504h
+----------2F4504-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - STOP PROFILING
+	AX = 4504h
+Notes:	profiling is also turned off by the key combination
+	  LeftShift + RightShift
+	for PROF.COM, this programs the CMOS clock by reading register 0Ch
+	  and clearing bit 6 of register 0Bh.  It then masks IRQ8.
+SeeAlso: AX=4503h,AX=4505h,AX=4506h,AX=4507h
+----------2F4505-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - CLEAR PROFILING DATA
+	AX = 4505h
+SeeAlso: AX=4503h,AX=4504h,AX=4506h
+----------2F4506-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFlush"
+	AX = 4506h
+SeeAlso: AX=4505h,AX=4507h
+----------2F4507-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFinish"
+	AX = 4507h
+Note:	this call is essentially a "ProfStop" (AX=4504h) followed by
+	  "ProfFlush" (AX=4506h)
+SeeAlso: AX=4504h,AX=4505h,AX=4506h
+----------2F4508-----------------------------
+INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - ALTERNATE SEGDEBUG IFACE
+	AX = 4508h
+	BX = ordinal (or 0000h)
+	CX = segment
+	DX = instance (or 0000h)
+	SI = type (or 0000h)
+	ES:DI -> ASCIZ module name
+Notes:	this call is an alternate entry to the profiler's SEGDEBUG
+	  interface, but only to function 0, for notifying the profiler of
+	  each new segment loaded.  The SHOWHITS utility then examines the
+	  profiler's output files (CSIPS.DAT and SEGENTRY.DAT) in conjunction
+	  with symbol files to provide information in a useful form.
+	this call does not have a corresponding Windows function
+SeeAlso: AX=4500h
+----------2F4601-----------------------------
+INT 2F U - DOS 5.0 kernel - ???
+	AX = 4601h
+Return: ???
+Note:	copies the MCB following the caller's PSP memory block into DOS data
+	  segment
+SeeAlso: AX=4602h
+----------2F4602-----------------------------
+INT 2F U - DOS 5.0 kernel - ???
+	AX = 4602h
+Return: ???
+Note:	copies previously copied MCB from DOS data segment into MCB following
+	  caller's PSP memory block
+SeeAlso: AX=4601h
+----------2F46-------------------------------
+INT 2F U - ???
+	AH = 46h
+	AL = subfunction (03h,04h)
+Return: ???
+Note:	these two subfunctions are called by MS Windows 3.0
+----------2F4653CX0002-----------------------
+INT 2F - F-PROT v1.x only - F-LOCK.EXE
+	AX = 4653h
+	CX = 0002h
+	BX = subfunction
+h  installation check
+		Return: AX = FFFFh
+h  uninstall
+		Return: AX,BX,ES destroyed
+h  disable (v1.08 and below only)
+h  enable (v1.08 and below only)
+Note:	F-LOCK is part of the F-PROT virus/trojan protection package by Fridrik
+	  Skulason
+SeeAlso: AX=4653h/CX=0003h,AX=CA00h,INT 21/AX=4BEEh
+----------2F4653CX0003-----------------------
+INT 2F - F-PROT v1.x only - F-XCHK.EXE
+	AX = 4653h
+	CX = 0003h
+	BX = subfunction
+h  installation check
+		Return: AX = FFFFh
+h  uninstall
+		Return: AX,BX,ES destroyed
+Note:	F-XCHK is part of the F-PROT virus/trojan protection package by Fridrik
+	  Skulason
+SeeAlso: AX=4653h/CX=0002h,AX=4653h/CX=0004h,AX=CA00h
+----------2F4653CX0004-----------------------
+INT 2F - F-PROT v1.x only - F-POPUP.EXE
+	AX = 4653h
+	CX = 0004h
+	BX = subfunction
+h  installation check
+		Return: AX = FFFFh
+h  uninstall
+		Return: AX,BX,ES destroyed
+h  disable (v1.08 and below only)
+		   display message (v1.14+)
+			other registers: ???
+h  enable (v1.08 and below only)
+		   display message (v1.14+)
+			other registers: ???
+			Return: AX = key pressed by user
+Note:	F-POPUP is part of the F-PROT virus/trojan protection package by
+	  Fridrik Skulason
+SeeAlso: AX=4653h/CX=0003h,AX=4653h/CX=0005h,AX=CA00h
+----------2F4653CX0005-----------------------
+INT 2F - F-PROT v1.x only - F-DLOCK.EXE
+	AX = 4653h
+	CX = 0005h
+	BX = subfunction
+h installation check
+		Return: AX = FFFFh
+h uninstall
+		Return: AX,BX,ES destroyed
+Note:	F-DLOCK is part of the F-PROT virus/trojan protection package by
+	  Fridrik Skulason
+SeeAlso: AX=4653h/CX=0004h,AX=CA00h
+----------2F4680-----------------------------
+INT 2F - MS Windows v3.0 - INSTALLATION CHECK
+	AX = 4680h
+Return: AX = 0000h MS Windows 3.0 running in real (/R) or standard (/S) mode,
+		   or DOS 5 DOSSHELL active
+	   nonzero  no Windows, Windows prior to 3.0, or Windows3 in enhanced
+		    mode
+Note:	not officially documented, but Microsoft has indicated that they
+	  intend to provide an installation check which works in all modes
+SeeAlso: AX=1600h
+----------2F4800-----------------------------
+INT 2F - DOS v5.0 DOSKEY - INSTALLATION CHECK
+	AX = 4800h
+Return: AL = nonzero if installed
+SeeAlso: AX=4810h
+----------2F4810-----------------------------
+INT 2F - DOS v5.0 DOSKEY - READ INPUT LINE FROM CONSOLE
+	AX = 4810h
+	DS:DX -> line buffer (see INT 21/AH=0Ah)
+Return: AX = 0000h if successful
+Notes:	the first byte (length) of the buffer MUST be 80h, or DOSKEY chains to
+	  the previous handler
+	if the user's input is a macro name, no text is placed in the buffer
+	  even though AX=0000h on return; the program must immediately issue
+	  this call again to retrieve the expansion of the macro.  Similarly,
+	  if the user enters a special parameter such as $*, this call must
+	  be repeated to retrieve the expansion; on the second call, DOSKEY
+	  overwrites the macro name on the screen with its expansion.
+SeeAlso: AX=4800h,INT 21/AH=0Ah
+----------2F4A00CX0000-----------------------
+INT 2F U - DOS v5.0 - SINGLE-FLOPPY LOGICAL DRIVE CHANGE NOTIFICATION
+	AX = 4A00h
+	CX = 0000h
+	DH = new drive number
+	DL = current drive number
+Return: CX = FFFFh to skip "Insert diskette for drive X:" message
+Note:	called by MSDOS 5.00 IO.SYS just before displaying the message
+	  "Insert diskette for drive X:" on single-floppy systems
+----------2F4A01-----------------------------
+INT 2F - DOS v5.0 - QUERY FREE HMA SPACE
+	AX = 4A01h
+Return: BX = number of bytes available in HMA (0000h if DOS not using HMA)
+	ES:DI -> start of available HMA area (FFFFh:FFFFh if not using HMA)
+SeeAlso: AX=4310h,AX=4A02h
+----------2F4A02-----------------------------
+INT 2F - DOS v5.0 - ALLOCATE HMA SPACE
+	AX = 4A02h
+	BX = number of bytes
+Return: ES:DI -> start of allocated HMA block or FFFFh:FFFFh
+	BX destroyed
+Note:	this call is not valid unless DOS is loaded in the HMA (DOS=HIGH)
+SeeAlso: AX=4A01h
+----------2F4A05-----------------------------
+INT 2F U - DOS v5.0 DOSSHELL - ???
+	AX = 4A05h
+	SI = function
+h reset???
+h ???
+h ???
+h ???
+h ???
+		BL = ???
+h ???
+h get ???
+		Return: ES:DI -> ???
+h get ???
+		Return: AX = ???
+h get ???
+		Return: DX:AX -> ???
+h get ???
+		Return: ES = ???
+Ah ???
+		BL = ???
+		ES:DI -> ???
+Bh get ???
+		Return: AX = ???
+Ch ???
+		BL = ???
+		Return: DX:AX -> ???
+Notes:	DOSSHELL chains to the previous handler if SI is not one of the values
+	  listed above
+	the DOSSWAP.EXE module calls functions 03h,04h,05h,07h,08h,09h,0Ch
+SeeAlso: AX=4B01h
+----------2F4A06-----------------------------
+INT 2F U - ??? - GET MEMORY SIZE
+	AX = 4A06h
+	DX = segment following last byte of conventional memory
+Return: DX = segment following last byte of memory available for use by DOS
+Note:	called by MSDOS 5.00 IO.SYS startup code if the signature "RPL" is
+	  present three bytes beyond the INT 2F handler; this call overrides
+	  the value returned by INT 12
+SeeAlso: INT 12
+----------2F4A10-----------------------------
+INT 2F - SMARTDRV v4.00+ - API
+        AX = 4A10h
+        BX = command
+h installation check and hit ratios
+                Return: AX = BABEh if installed
+                            DX:BX = cache hits
+                            DI:SI = cache misses
+                            CX = ???
+                            BP = version (4.00 = 0400h)
+h reset cache
+h flush buffers
+h status
+                BP = drive # (0=A, 1=B, etc.)
+                DL = subfunction
+h only get information
+h turn on read cache
+h turn off read cache
+h turn on write cache
+h turn off write cache
+	    	Return: AX = BABEh if OK
+                       	DL = status
+                            bit 7  not cached
+			    bit 6  write-through
+			    bit 5  ???
+			    bits 0-4 drive # (0=A, 1=B...)
+                        DL = FFh if drive does not exist
+                Note:	If the read cache is off, reads will not be cached,
+			  but writes will continue to be cached if the write-
+			  cache is enabled.
+h cache size
+                Return: AX = ???
+                        BX = largest number of elements
+                        CX = size of elements in bytes
+                        DX = number of elements under Windows
+h double-buffer status
+                BP = drive # (0=A, 1=B...)
+                Return: AX = BABEh if double-buffered
+h ???
+                Return: DI = random number???
+Ah get table pointer???
+                Return: ES:BX -> table of about 10 bytes or 5 words. Seems to
+				be words pointing to memory addresses
+				containing info??? (see below)
+h signal serious error
+                pops up a message box saying that a serious error occurred and
+                  to hit R to retry.
+SeeAlso: INT 21/AX=4402h"SMARTDRV",INT 21/AX=4403h"SMARTDRV"
+Format of data table:
+Offset	Size	Description
+h  8 BYTEs	???
+h	WORD	offset of WORD containing number of elements in cache
+----------2F4B-------------------------------
+INT 2F - LAN Manager 2.0 DOS Enh NETWKSTA.EXE - NETWORK WORKSTATION REDIRECTOR
+	AH = 4Bh
+	???
+Return: ???
+Note:	LAN Manager enhanced mode adds features beyond the standard redirector
+	  file/printer services
+SeeAlso: AX=118Ah,AH=41h,AH=42h
+----------2F4B01-----------------------------
+INT 2F - DOS v5.0 TASK SWITCHER - BUILD CALLOUT CHAIN
+	AX = 4B01h
+	CX:DX -> task switcher entry point (see AX=4B02h)
+	ES:BX = 0000h:0000h
+Return: ES:BX -> callback info structure (see below) or 0000h:0000h
+Notes:	called by the task switcher
+	this function is hooked by clients which require notification of task
+	  switcher activities; the call must first be passed on to the prior
+	  handler with registers unchanged using a simulated interrupt.	 On
+	  return, the client must build a callback info structure and store
+	  the returned ES:BX in the "next" field, then return the address of
+	  its own callback info structure.
+	a client program must add itself to the notification chain if it
+	  provides services to other programs; before terminating, it must
+	  remove itself from the chain by calling the task switcher's entry
+	  point with AX=0005h (see AX=4B02h)
+	the task switcher entry point should not be saved, as it is subject to
+	  change and will be provided on any notification call
+	the Windows 3.1 Standard Mode supports this API
+SeeAlso: AX=4B02h
+Format of callback info structure:
+Offset	Size	Description
+h	DWORD	pointer to next callback info structure
+h	DWORD	pointer to notification function (see below)
+h	DWORD	reserved
+Ch	DWORD	address of zero-terminated list of API info structures
+		(see AX=4B02h)
+Notification function is called with:
+	AX = function
+h switcher initialization
+		Return: AX = 0000h if OK to load
+			   = nonzero to abort task switcher
+h query suspend
+		BX = session ID
+		Return: AX = 0000h if OK to switch session
+			   = 0001h if not
+h suspend session
+		BX = session ID
+		interrupts disabled
+		Return: AX = 0000h if OK to switch session
+			   = 0001h if not
+h activate session
+		BX = session ID
+		CX = session status flags
+			bit 0: set if first activation of session
+			bits 1-15: reserved (0)
+		interrupts disabled
+		Return: AX = 0000h
+h session active
+		BX = session ID
+		CX = session status flags
+			bit 0: set if first activation of session
+			bits 1-15: reserved (0)
+		Return: AX = 0000h
+h create session
+		BX = session ID
+		Return: AX = 0000h if OK to create session
+			   = 0001h if not
+h destroy session
+		BX = session ID
+		Return: AX = 0000h
+h switcher termination
+		BX = flags
+		    bit 0: set if calling switcher is only switcher loaded
+		    bits 1-15: reserved (0)
+		Return: AX = 0000h
+	ES:DI -> task switcher entry point (see AX=4B02h)
+Notes:	function 0000h is generally called by the program which controls or
+	  invokes the task switcher, rather than by the task switcher itself;
+	  the entry point supplied to this function is not necessarily the
+	  entry point to the task switcher itself, and may be 0000h:0000h.  If
+	  any client indicates that loading is not possible, all clients will
+	  be called with function 0007h; thus it is possible for a client to
+	  receive a termination notice without a corresponding initialization
+	  notice.
+	except for functions 0002h and 0003h, the notification handler is
+	  called with interrupts enabled and may make any INT 21h function
+	  call; interrupts must not be enabled in functions 0002h and 0003h
+	function 0007h may be called with ES:DI = 0000h:0000h if the entry
+	  point is no longer valid
+----------2F4B02BX0000-----------------------
+INT 2F - DOS v5.0 TASK SWITCHER - INSTALLATION CHECK
+	AX = 4B02h
+	BX = 0000h
+	ES:DI = 0000h:0000h
+Return: ES:DI = 0000h:0000h if task switcher not loaded
+	ES:DI -> task switcher entry point (see below) if loaded
+	    AX = 0000h
+Note:	the returned entry point is that for the most-recently loaded task
+	  switcher; the entry points for prior task switchers may be determined
+	  with the "get version" call (see below)
+SeeAlso: AX=4A05h,AX=4B03h
+Call task switcher entry point with:
+	AX = 0000h get version
+		Return: CF clear if successful
+			    AX = 0000h
+			    ES:BX -> task switcher version struct (see below)
+			CF set if unsupported function
+	AX = 0001h test memory region
+		ES:DI -> first byte to be tested
+		CX = size of region to test
+		Return: CF clear if successful
+			    AX = memory type of tested region
+h global
+h global and local
+h local (replaced on session switch)
+			CF set if unsupported function
+	AX = 0002h suspend switcher
+		ES:DI -> new task switcher's entry point
+		Return: CF clear if successful
+			    AX = state
+h switcher has been suspended
+h switcher not suspended, new switcher must
+					abort
+h switcher not suspended, but new switcher
+					may run anyway
+			CF set if unsupported function
+	AX = 0003h resume switcher
+		ES:DI -> new task switcher's entry point
+		Return: CF clear if successful
+			    AX = 0000h
+			CF set if unsupported function
+	AX = 0004h hook notification chain
+		ES:DI -> callback info structure to be added to chain
+			(see AX=4B01h)
+		Return: CF clear if successful
+			    AX = 0000h
+			CF set if unsupported function
+	AX = 0005h unhook notification chain
+		ES:DI -> callback info structure to be removed from chain
+			(see AX=4B01h)
+		Return: CF clear if successful
+			    AX = 0000h
+			CF set if unsupported function
+	AX = 0006h query API support
+		BX = asynchronous API identifier
+		Return: CF clear if successful
+			    AX = 0000h
+			    ES:BX -> API info structure (see below) for the
+					client which provides the highest
+					level of
+			CF set if unsupported function
+Format of task switcher version structure:
+Offset	Size	Description
+h	WORD	major version of supported protocol  (current protocol is 1.0)
+h	WORD	minor version of supported protocol
+h	WORD	major version of task switcher
+h	WORD	minor version of task switcher
+h	WORD	task switcher ID (see AX=4B03h)
+Ah	WORD	operation flags
+		bit 0: set if task switcher disabled
+		bits 1-15: reserved (0)
+Ch	DWORD	pointer to ASCIZ task switcher name
+		("MS-DOS Shell Task Switcher" for DOSSHELL task switcher)
+h	DWORD	pointer to previous task switcher's entry point or 0000h:0000h
+Format of API info structure:
+Offset	Size	Description
+h	WORD	size of structure in bytes (000Ah)
+h	WORD	API identifier
+h NetBIOS
+h 802.2
+h TCP/IP
+h LAN Manager named pipes
+h Novell NetWare IPX
+h	WORD	major version \ of highest version of API for which the support
+h	WORD	minor version / level specified in the next field is provided
+h	WORD	support level
+h minimal support
+h API-level support
+h switcher compatibility
+h seamless compatibility
+----------2F4B03-----------------------------
+INT 2F - DOS v5.0 TASK SWITCHER - ALLOCATE SWITCHER ID
+	AX = 4B03h
+	ES:DI -> task switcher entry point (see AX=4B02h)
+Return: AX = 0000h
+	BX = switcher ID (0001h-000Fh), or 0000h if no more available
+Notes:	if a task switcher has determined that it is the first to be loaded, it
+	  must allocate an identifier for itself and provide this function to
+	  all subsequent task switchers; if it is not the first to be loaded,
+	  it must call this function to allocate an ID.	 The switcher ID is
+	  used as the high four bits of all session identifiers to ensure
+	  unique session IDs.
+	if no more switcher IDs are available, the new task switcher making the
+	  call must terminate or disable itself
+	the task switcher providing the identifiers may call the new task
+	  switcher's entry point as needed
+	this call is available from within DOSSHELL even if the task switcher
+	  is not installed
+SeeAlso: AX=4B02h,AX=4B04h
+----------2F4B04-----------------------------
+INT 2F - DOS v5.0 TASK SWITCHER - FREE SWITCHER ID
+	AX = 4B04h
+	BX = switcher ID
+	ES:DI -> task switcher entry point (see AX=4B02h)
+Return: AX = 0000h
+	BX = status
+h successful
+	    other error (invalid ID or ID not allocated)
+Notes:	called by a task switcher when it exits, unless it was the first loaded
+	  and is providing the support for AX=4B03h and AX=4B04h
+	the task switcher providing the identifiers may call the terminating
+	  task switcher's entry point as needed
+	this call is available from within DOSSHELL even if the task switcher
+	  is not installed
+SeeAlso: AX=4B02h,AX=4B03h
+----------2F4B05-----------------------------
+INT 2F - DOS v5.0 DOSSHELL TASK SWITCHER - IDENTIFY INSTANCE DATA
+	AX = 4B05h
+	ES:BX = 0000h:0000h
+	CX:DX -> task switcher entry point (see AX=4B02h)
+Return: ES:BX -> startup info structure (see below) or 0000h:0000h
+Notes:	called by task switcher
+	clients with instance data should hook this call, pass it through to
+	  the previous handler with unchanged registers using a simulated
+	  interrupt.  On return, the client should create a startup info
+	  structure (see below), store the returned ES:BX in the "next"
+	  field, and return the address of the created structure in ES:BX
+	all MSDOS function calls are available from within this call
+SeeAlso: AX=1605h,AX=4B02h
+Format of startup info structure:
+Offset	Size	Description
+h  2 BYTEs	major, minor version of info structure (03h,00h)
+h	DWORD	pointer to next startup info structure or 0000h:0000h
+h	DWORD	0000h:0000h (ignored)
+Ah	DWORD	ignored
+Eh	DWORD	pointer to instance data records
+Format of one instance data record in array:
+Offset	Size	Description
+h	DWORD	address of instance data (end of array if 0000h:0000h)
+h	WORD	size of instance data
+----------2F53-------------------------------
+INT 2F U - ???
+	AH = 53h
+	AL = subfunction (0Bh, maybe others???)
+Return: ???
+Note:	called by MS Windows 3.1 POWER.DRV; hooked by MS Mouse driver v8.20+
+SeeAlso: AH=54h,INT 33/AX=002Fh
+----------2F54-------------------------------
+INT 2F U - ???
+	AH = 54h
+	AL = subfunction (00h, 01h, maybe others???)
+Return: ???
+Note:	called by MS Windows 3.1 POWER.DRV
+SeeAlso: AH=53h
+----------2F5453-----------------------------
+INT 2F - TesSeRact RAM-RESIDENT PROGRAM INTERFACE
+	AX = 5453h
+	BX = subfunction
+h installation check
+		CX = 0000h
+		DS:SI -> 8-char blank-padded name
+		Return: AX = FFFFh installed
+				CX = ID number of already-installed copy
+			   = anything else, not installed
+				CX = ID number for TSR when installed
+h get user parameters
+		CX = TSR ID number
+		Return: AX = 0000h successful
+			   ES:BX -> user parameter block (see below)
+			   = nonzero failed
+h check if hotkey in use
+		CL = scan code of hot key
+		Return: AX = FFFFh hot key conflicts with another TSR
+			     otherwise safe to use the hotkey
+h replace default critical error handler
+		CX = TSR ID number
+		DS:SI -> new routine for INT 24h
+		Return: AX = nonzero, unable to install new handler
+h get internal data area
+		CX = TSR ID number
+		Return: AX = 0000h
+			    ES:BX -> TSR's internal data area (see below)
+			   = nonzero, TSR not found
+h set multiple hot keys
+		CX = TSR ID number
+		DL = number of additional hot keys to allocate
+		DS:SI -> table of hot keys
+			BYTE  hotkey scan code
+			BYTE  hotkey shift state
+			BYTE  flag value to pass to TSR (nonzero)
+		Return: AX = nonzero, unable to install hot keys
+h - 0Fh reserved
+h enable TSR
+		CX = TSR ID number
+		Return: AX = nonzero, unable to enable
+h disable TSR
+		CX = TSR ID number
+		Return: AX = nonzero, unable to disable
+h unload TSR
+		CX = TSR ID number
+		Return: AX = nonzero, invalid TSR number
+		Note: if any interrupts used by TSR have been grabbed by
+			another TSR, the TesSeRact routines will wait until
+			it is safe to remove the indicated TSR from memory
+h restart TSR
+		CX = TSR ID number of TSR which was unloaded but is still in
+		     memory
+		Return: AX = nonzero, unable to restart TSR
+h get status word
+		CX = TSR ID number
+		Return: AX = FFFFh invalid ID number
+			   = other, successful
+				BX = bit flags
+h set status word
+		CX = TSR ID number
+		DX = new bit flags
+		Return: AX = nonzero, unable to set status word
+h get INDOS state at popup
+		CX = TSR ID number
+		Return: AX = 0000h successful
+			    BX = value of INDOS flag
+h - 1Fh reserved
+h call user procedure
+		CX = TSR ID number
+		ES:DI -> user-defined data
+		Return: AX = 0000h successful
+h stuff keystrokes into keyboard buffer
+		CX = TSR ID number
+		DL = speed
+h stuff keystrokes only when buffer is empty
+h stuff up to four keystrokes per clock tick
+h stuff up to 15 keystrokes per clock tick
+		DH = scan code flag
+		    if zero, buffer contains alternating ASCII and scan codes
+		    if nonzero, buffer contains only ASCII codes
+		SI = number of keystrokes
+		ES:DI -> buffer to stuff
+		Return: AX = 0000h success
+			     F0F0h user aborted with ^C or ^Break
+			     other unable to stuff keystrokes
+h (v1.10) trigger popup
+		CX = TSR ID number
+		Return: AX = 0000h success, TSR will either pop up or beep to
+				   indicate that it is unable to pop up
+			     nonzero invalid ID number
+h (v1.10) invoke TSR's background function
+		CX = TSR ID number
+		Return: AX = 0000h success
+			     FFFFh not safe to call background function
+			     nonzero invalid ID number
+h - 2Fh reserved
+Notes:	Borland's THELP.COM popup help system for Turbo Pascal and Turbo C
+	  (versions 1.x and 2.x only) fully supports the TesSeRact API, as
+	  do the SWAP?? programs by Innovative Data Concepts.
+	AVATAR.SYS supports functions 00h and 01h (only the first three fields
+	  of the user parameter block) using the name "AVATAR  "
+SeeAlso: AX=CAFEh
+Format of User Parameter Block:
+Offset	Size	Description
+h  8 BYTEs	blank-padded TSR name
+h	WORD	TSR ID number
+Ah	DWORD	bitmap of supported functions
+Eh	BYTE	scan code of primary hotkey
+h = pop up when shift states match
+		    FFh = no popup (if shift state also FFh)
+Fh	BYTE	shift state of primary hotkey
+		    FFh = no popup (if scan code also FFh)
+h	BYTE	number of secondary hotkeys
+h	DWORD	pointer to extra hotkeys set by func 05h
+h	WORD	current TSR status flags
+h	WORD	PSP segment of TSR
+h	DWORD	DTA for TSR
+Dh	WORD	default DS for TSR
+Fh	DWORD	stack at popup
+h	DWORD	stack at background invocation
+Format of TSR internal data area:
+Offset	Size	Description
+h	BYTE	revision level of TesSeRact library
+h	BYTE	type of popup in effect
+h	BYTE	INT 08 occurred since last invocation
+h	BYTE	INT 13 occurred since last invocation
+h	BYTE	active interrupts
+h	BYTE	active soft interrupts
+h	BYTE	DOS major version
+h	BYTE	how long to wait before popping up
+h	DWORD	pointer to INDOS flag
+CH	DWORD	pointer to DOS critical error flag
+h	WORD	PSP segment of interrupted program
+h	WORD	PSP segment of prog interrupted by INT 28
+h	DWORD	DTA of interrupted program
+h	DWORD	DTA of program interrupted by INT 28
+Ch	WORD	SS of interrupted program
+Eh	WORD	SP of interrupted program
+h	WORD	SS of program interrupted by INT 28
+h	WORD	SP of program interrupted by INT 28
+h	DWORD	INT 24 of interrupted program
+h  3 WORDs	DOS 3+ extended error info
+Eh	BYTE	old BREAK setting
+Fh	BYTE	old VERIFY setting
+h	BYTE	were running MS WORD 4.0 before popup
+h	BYTE	MS WORD 4.0 special popup flag
+h	BYTE	enhanced keyboard call in use
+h	BYTE	delay for MS WORD 4.0
+times (for INTs 08h,09h,13h,16h,1Ch,21h,28h,2Fh,1Bh,23h, and 24h):
+	DWORD	old interrupt vector
+	BYTE	interrupt number
+	WORD	offset in TesSeRact code segment of new interrupt handler
+----------2F5500-----------------------------
+INT 2F U - DOS v5.0 - COMMAND.COM INTERFACE
+	AX = 5500h
+Return: AX = 0000h
+	DS:SI -> entry point table
+Notes:	used to access the shareable portion of COMMAND.COM, which may have
+	  been moved into the HMA; only the primary COMMAND.COM retains this
+	  portion
+	procedures called from a dispatcher in COMMAND's resident portion;
+	  most assume that the segment address of the resident portion is on
+	  the stack and are thus not of general use
+----------2F6282-----------------------------
+INT 2F U - PC Tools v7.0+ VDEFEND, DATAMON - SET ??? ADDRESS
+	AX = 6282h
+	CX:DX -> ??? or 0000h:0000h
+	DI = 0000h ???
+	     FFFFh ???
+	     other segment of ???
+Return: BX = 0062h
+Note:	if CX:DX = 0000h:0000h on entry, the ??? address is not changed
+	  (DATAMON only)
+SeeAlso: INT 21/AH=FAh"VDEFEND"
+----------2F6284BX0000-----------------------
+INT 2F U - PC Tools v7.0+ DATAMON - INSTALLATION CHECK
+	AX = 6284h
+	BX = 0000h
+	CX = 0000h
+Return: AX = segment of resident code
+	BX = 5555h
+	CX = 5555h
+----------2F6284BX0001-----------------------
+INT 2F U - PC Tools v7.0+ DATAMON - GET ???
+	AX = 6284h
+	BX = 0001h
+	CX = 0001h
+Return: AX:BX -> ???
+	CX = BX
+----------2F6284BX0002-----------------------
+INT 2F U - PC Tools v7.0+ DATAMON - GET ???
+	AX = 6284h
+	BX = 0002h
+	CX = 0002h
+Return: AX = ???
+	BX = ???
+	CX = AX
+	DX = BX
+----------2F6284BX0003-----------------------
+INT 2F U - PC Tools v7.0+ DATAMON - SET ??? FLAGS
+	AX = 6284h
+	BX = 0003h
+	CX = flags
+	    bit 12: ???
+: ???
+: ???
+: ???
+	DX = flags
+	    bit 15: ???
+----------2F6400-----------------------------
+INT 2F - SCRNSAV2.COM - INSTALLATION CHECK
+	AX = 6400h
+Return: AL = 00h not installed
+	     FFh installed
+Note:	SCRNSAV2.COM is a screen saver for PS/2's with VGA by Alan Ballard
+SeeAlso: INT 10/AX=5555h
+----------2F7200-----------------------------
+INT 2F - SRDISK v1.30 - INSTALLATION CHECK
+	AX = 7200h
+Return: AL = FFh if installed
+	    ES = segment of device driver header (see below)
+Note:	SRDISK is a freeware resizeable RAMdisk by Marko Kohtala
+Format of device driver header:
+Offset	Size	Description
+h 10 BYTEs	same as standard device driver header (see INT 21/AH=52h)
+Ah	BYTE	number of subunits (drives) supported by driver
+Bh  3 BYTEs	signature "SRD"
+Eh  4 BYTEs	memory type string (currently only "XMS ")
+h  4 BYTEs	ASCII driver version string "N.NN"
+h	BYTE	00h
+h	BYTE	configuration format version (currently 00h)
+h	WORD	offset of drive configuration data
+----------2F7A00-----------------------------
+INT 2F - Novell NetWare - LOW-LEVEL API (IPX) INSTALLATION CHECK
+	AX = 7A00h
+Return: AL = 00h not installed
+	   = FFh installed
+		ES:DI -> FAR entry point for routines accessed exclusively
+			through INT 7A in NetWare versions through 2.0a.  Call
+			with same values as INT 7A
+SeeAlso: AX=7AFFh/BX=0000h,AX=D800h,INT 64"Novell",INT 7A"Novell"
+----------2F7A10-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - GET TBMI STATUS
+	AX = 7A10h
+Return: DH = major TBMI version number
+	DL = minor TBMI version number
+	CX = segment address of TBMI resident part
+	BX = status word of TBMI
+		bit 0: INT2F intercepted by TBMI
+		bit 1: INT7A intercepted by TBMI
+		bit 2: INT64 intercepted by TBMI
+		bits 3-14: reserved or unused ???
+		bit 15: outstanding task ID was detected
+Note:	TBMI is the Task-Switched Buffer Manager Interface
+SeeAlso: AX=7A11h,AX=7A12h,AX=7A13h,AX=7A14h
+----------2F7A11-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - GET INT2F HANDLERS
+	AX = 7A11h
+Return: ES:BX -> old INT 2F handler
+	DS:DX -> TBMI INT 2F handler
+SeeAlso: AX=7A10h,AX=7A12h,AX=7A13h
+----------2F7A12-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - GET INT64 HANDLERS
+	AX = 7A12h
+Return: ES:BX -> old INT 64 handler
+	DS:DX -> TBMI INT 64 handler
+SeeAlso: AX=7A10h,AX=7A11h,AX=7A13h
+----------2F7A13-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - GET INT7A HANDLERS
+	AX = 7A13h
+Return: ES:BX = old INT 7A handler
+	DS:DX = TBMI INT 7A handler
+SeeAlso: AX=7A10h,AX=7A11h,AX=7A12h
+----------2F7A14-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - GET STATISTICS
+	AX = 7A14h
+	CX = statistic to retrieve
+h available diagnostic functions???
+		Return: CX = maximum available function??? (000Ch for v2.0)
+h buffers in use
+		Return: CX = TBMI buffers currently in use
+h maximum buffers used
+		Return: CX = maximum number of buffers ever in use
+h unavailable buffers
+		Return: CX = count of unavailable TBMI buffers
+h old interrupt usage
+		Return: CX = TBMI accesses to intercepted old vectors INT 2F,
+				INT 64, and INT 7A
+h far call usage
+		Return: CX = TBMI accesses to IPX/SPX far call handler (not
+				including internal accesses)
+h task buffering
+		Return: CX = TBMI task buffering status (enabled/disabled or
+				disable/enable switch count???)
+h current task ID
+		Return: CX = TBMI current task ID number (0000h if ???)
+h outstanding ID count
+		Return: CX = number of outstanding TBMI IDs
+h configured ECBs
+		Return: CX = number of TBMI Event Control Blocks configured
+Ah configured data ECBs
+		Return: CX = number of TBMI data ECBs configured
+Bh configured sockets
+		Return: CX = number of TBMI sockets configured (from NETCFG)
+Ch current sockets
+		Return: CX = number of TBMI sockets currently in use
+SeeAlso: AX=7A10h
+----------2F7A1B-----------------------------
+INT 2F - Novell NetWare - TBMI v2.0 - RESERVED???
+	AX = 7A1Bh
+Note:	this call merely performs an IRET
+----------2F7A80-----------------------------
+INT 2F - Novell NetWare - shell 3.01d - ???
+	AX = 7A80h
+Return: nothing
+Note:	apparently called on abnormal exit of the shell
+----------2F7A81-----------------------------
+INT 2F - Novell NetWare - shell 3.01d - ???
+	AX = 7A81h
+	CX:DX -> ??? in shell's CS (may be callback address or data structure)
+Return: nothing???
+----------2F7A85-----------------------------
+INT 2F - Novell NetWare - shell 3.01 - BROADCAST INFORM
+	AX = 7A85h
+	CX = broadcast server number
+Return: CX = 0000h if broadcast message handled by another program
+	CX unchanged if broadcast not handled
+----------2F7AFE-----------------------------
+INT 2F - Novell NetWare - shell 3.01d - ???
+	AX = 7AFEh
+Return: AL = FFh ???
+	     other ???
+----------2F7AFFBX0000-----------------------
+INT 2F - Novell NetWare - TBMI v2.0 - INSTALLATION CHECK???
+	AX = 7AFFh
+	BX = 0000h
+	CX = 4E65h ("Ne")
+	DX = 7457h ("tW")
+	ES:DI -> IPX/SPX special handler (XMS/EMS ???)
+Return: AL = FFh if installed
+	    CX = configured sockets (14h)
+	    DS:SI -> data table ???
+	    ES:DI -> IPX far call handler
+Note:	for IPX/SPX this call reportedly returns DS:DI pointing to the table
+	  of pointers to service events queue head and tail
+SeeAlso: AX=7AFFh/BX=0001h
+----------2F7AFFBX0001-----------------------
+INT 2F - Novell NetWare - TBMI v2.0, shell v3.01d - INSTALLATION CHECK???
+	AX = 7AFFh
+	BX = 0001h
+	CX = 4E65h ("Ne")
+	DX = 7457h ("tW")
+Return: AL = FFh if installed
+	    CX = ???  (8000h)
+	    SI = ??? (or -> ???) (0002h)
+	    ES:DI -> IPX far call handler
+	    ES:DX -> 6-byte data area ???
+SeeAlso: AX=7AFFh/BX=0000h
+----------2F7F24-----------------------------
+INT 2F - Multiplex - ???
+	AX = 7F24h
+	???
+Return: ???
+Note:	called by PC/370, an IBM 370 emulator by Donald S. Higgins
+----------2F7F26-----------------------------
+INT 2F - Multiplex - ???
+	AX = 7F26h
+	???
+Return: ???
+Note:	called by PC/370, an IBM 370 emulator by Donald S. Higgins
+---------------------------------------------
+Interrupt List, part 5 of 7
+This compilation is Copyright (c) 1989,1990,1991,1992 Ralf Brown
+----------2F8000-----------------------------
+INT 2F - EASY-NET - INSTALLATION CHECK
+	AX = 8000h
+Return: AL = 00h not installed
+	     FFh installed
+Note:	EASY-NET is a shareware two-machine serial-port network
+----------2F8000-----------------------------
+INT 2F - Nanosoft, Inc. TurboNET server - INSTALLATION CHECK
+	AX = 8000h
+Return: AL = FFh if installed
+	    BX = CS of resident code
+	    CX = ??? (03FCh)
+Note:	TurboNET is a NetBIOS-based file redirector and server; a demonstration
+	  version may be downloaded from Nanosoft's BBS
+SeeAlso: AX=8100h
+----------2F8000DX0000-----------------------
+INT 2F - FaxBIOS interface - INSTALLATION CHECK
+	AX = 8000h
+	DX = 0000h
+	DI = 0000h
+Return: AL = FFh if installed
+	DX:DI -> signature "FaxBiosjpc"
+Note:	FaxBIOS may use any multiplex number from 80h through FFh; to determine
+	  whether it is installed, it is necessary to poll all multiplex
+	  numbers for one which returns the above signature
+SeeAlso: AH=2Ah,AX=80FBh
+----------2F8001-----------------------------
+INT 2F - Nanosoft, Inc. TurboNET server - ???
+	AX = 8001h
+	DS:SI -> 16-byte buffer for ???
+Return: AH = status
+h successful
+h error
+Note:	makes NetBIOS calls
+----------2F80FB-----------------------------
+INT 2F - FaxBIOS interface - COMMAND SUBMISSION
+	AX = 80FBh
+	BX = function number (see below)
+	DX:DI -> command buffer (see below)
+Return: AL = FFh if submitted OK
+	CX = result code (see below)
+Note:	FaxBIOS may use any multiplex number from 80h through FFh
+SeeAlso: AX=8000h"FaxBIOS",AX=CBDDh
+Values for function number:
+h	SYS_LOGIN
+h	SYS_LOGOUT
+h	SYS_GET_FAXAPP_INFO
+h	STAT_IO_GET
+h	STAT_FAXBIOS_GET
+h	PDIR_OPEN
+h	PDIR_CLOSE
+h	PDIR_READ_PERSON
+h	PDIR_PARTIAL_READ
+Ah	PDIR_READ_GROUP
+Bh	PDIR_READ_MEMBER_LIST
+Ch	PDIR_WRITE_PERSON
+Dh	PDIR_WRITE_GROUP
+Eh	PDIR_DELETE_PERSON
+Fh	PDIR_DELETE_GROUP
+h	PDIR_READ_GROUP_LIST
+h	PDIR_IN_GROUP
+h	PDIR_OUT_GROUP
+h	SCHED_OPEN
+h	SCHED_ADD_DEST
+h	SCHED_ADD_FILE
+h	SCHED_SET_PARAMS
+h	SCHED_CANCEL
+h	SCHED_CLOSE
+h	SLOG_OPEN
+Ah	SLOG_CLOSE
+Bh	SLOG_SHORT_ENV_STAT
+Ch	SLOG_LONG_ENV_STAT
+Dh	SLOG_DEST_STAT
+Eh	SLOG_FILE_STAT
+Fh	SLOG_CANCEL_ENV
+h	RLOG_OPEN
+h	RLOG_CLOSE
+h	RLOG_READ
+h	GRAPH_GET_FILE_TYPE
+h	GRAPH_EXPORT_FILE
+h	GRAPH_GET_LAYOUT_INFO
+h	GRAPH_CREATE_FILE
+h	GRAPH_CLOSE_FILE
+h	GRAPH_CREATE_PAGE
+h	GRAPH_WRITE
+Ah	GRAPH_END_PAGE
+Bh	GRAPH_OPEN_FILE
+Ch	GRAPH_GOTO_PAGE
+Dh	GRAPH_READ
+Eh	IOCTL_GET
+Fh	IOCTL_SET
+h	IOCTL_ANSWER_FAX
+h	IOCTL_DIAL
+Values for result code:
+h	successful
+h	not prepared or servicing another client (busy)
+h	call failed due to sharing (LOCKED)
+h	logged-in client limit reached (FULL)
+h	transport denied (TRANSPORT_DENIED)
+h	not implemented (NOT_IMPLEMENTED)
+h	aborted while in progress (ABORTED)
+h	permissions denied (PERMISSION_DENIED)
+h	requested data is no longer valid (NO_LONGER_VALID)
+h	unspecified system error occurred
+h	an internal file was not found
+h	an internal file could not be created
+h	an internal file could not be opened
+h	an internal file could not be closed
+h	error occurred writing to an internal file
+h	error occurred reading from an internal file
+h	bad or corrupted file encountered
+h	an access violation occurred
+h	an internal file is empty
+Ah	insufficient memory to process request
+Bh	FaxBIOS was unable to issue a handle
+Ch	an error internal to FaxBIOS occurred
+Dh	no room on disk
+h	unspecified error accessing client file
+h	file not found
+h	creation fault
+h	open fault
+h	close fault
+h	write fault
+h	read fault
+h	file corrupted
+h	access violation
+h	empty file
+h	unspecified argument error
+h	bad function
+h	bad option
+h	bad structure size
+h	bad buffer size
+h	bad client ID
+h	unspecified error with token
+h	cover sheet token was invalid
+h	logo token was invalid
+h	signature token was invalid
+h	font token was invalid
+h	phone directory token was invalid
+h	outbound route token was invalid
+h	priority token was invalid
+h	sort token was invalid
+h	billing token was invalid
+h	unspecified handle error
+h	bad Phone Directory handle
+h	bad scheduling handle
+h	bad read send log handle
+h	bad read receive log handle
+h	bad graphics handle
+h	data passed in structure was invalid
+h	name field given is invalid
+h	phone number given is invalid
+h	poll code submitted is invalid
+h	file type constant was invalid
+h	BFT constant not defined or supported
+h	resolution not defined or supported
+h	page length not defined or supported
+h	page width not defined or supported
+h	date & time requested are ridiculous
+Ah	Subject text was not an ASCIIZ string
+Bh	From text was not an ASCIIZ string
+Ch	requested envelope ID was not found
+Dh	requested envelope ID is not valid
+Eh	envelope requested was not found
+Fh	destination index is out of range
+h	file index is out of range
+h	index into receive log is out of range
+h	file name specified was incomplete or invalid
+h	page selected was out of range
+h	bit width more than byte width
+h	mode for open is not defined
+h	person index is out of range
+h	person ID is out of range
+h	group index out of range or invalid
+h	group ID out of range or invalid
+Ah	range of indices to read is invalid
+Bh	group name given is invalid
+Ch	field_to_use is badly specified
+Dh	predicate invalid for field specified
+h	unspecified client procedure error
+h	device of interest is not present
+h	device of interest has been removed
+h	device of interest is not responding
+h	device of interest is disabled
+h	could not dial because device was in use
+h	maximum destination limit exceeded
+h	maximum file limit exceeded
+h	scheduling closed with no destination
+h	scheduling closed with no files or poll
+Ah	scheduling closed with no parameters specified
+Bh	file type specified does not match file
+Ch	file type specified is not supported
+Dh	file submitted is not exportable
+Eh	file type specified is not imageable
+Fh	error converting file
+h	envelope could not be cancelled
+h	Phone Directory is full
+h	record is already in the Phone Directory
+h	selected group in Phone Directory is full
+h	person is already in the group
+h	person is not in the group & cannot be removed
+h	a graphics file to be created already exists
+h	a grphics file to be read is empty
+h	GRAPH_CREATE_PAGE called before GRAPH_END_PAGE
+h	graph read or write attempted without goto or create
+Ah	graph page contains no data
+Bh	Phone Directory is already open for this client
+Ch	schedule log is already open for this client
+Dh	receive log is aready open for this client
+Eh	Phone Directory function requires write mode
+h	denied exclusive use of the API
+Format of SYS_LOGIN command buffer:
+Offset	Size	Description
+h	WORD	structure size
+h	WORD	function number
+h	WORD	return code
+h	WORD	client ID
+h	WORD	API Major Version
+Ah	WORD	API Minor Version
+Ch	DWORD	reserved for manufacturer's use
+h 22 BYTEs	manufacturer's ID
+h	WORD	highest possible device number
+h	WORD	maximum destinations per envelope
+Ah	WORD	maximum files per envelope
+Ch	WORD	FaxBIOS capabilities bitmap
+ 		bit 0: transmit supported
+		bit 1: receive supported
+		bit 2: IOCTL supported
+		bit 3: IOCTL_DIAL supported
+		bit 4: IOCTL_ANSWER_FAX supported
+		bit 5: manual transmit supported
+		bit 6: optional phone services supported
+		bit 7: canonical phone objects
+		bit 8: seam with next supported
+Eh	DWORD	T.30 capabilities bitmap
+ 		bit 0:  low vertical resolution (minimum)
+		bit 1:  high vertical resolution
+		bit 2:  page width 107mm (4.21 in)
+		bit 3:  page width 151mm (5.91 in)
+		bit 4:  page width 215mm (8.46 in) (minimum)
+		bit 5:  page width 255mm (10.04 in)
+		bit 6:  page width 303mm (11.93 in)
+		bit 7:  unused
+		bit 8:  page length 297mm (11.69 in) (minimum)
+		bit 9:  page length 364mm (14.33 in)
+		bit 10: page length 279mm (11 in)
+		bit 11: page length unlimited
+		bit 12: Group 4 resolution 300x300
+		bit 13: Group 4 resolution 400x400
+		bit 14: able to respond to poll from remote
+		bit 15: able to poll remote
+		bit 16: binary file transfer supported
+h	WORD	IPC handle
+h	DWORD	amount of memory needed to load
+h	WORD	scope (00h for public, nonzero for private)
+Ah  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SYS_LOGOUT command buffer:
+Offset	Size	Description
+h	WORD	structure size
+h	WORD	function number
+h	WORD	return code
+h	WORD	client ID
+h	DWORD	client tag (for client's internal use)
+Ch  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SYS_GET_FAXAPP_INFO command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch 80 BYTEs	FaxBIOS data
+Ch 80 BYTEs	default cover
+ ACh 80 BYTEs	default logo
+ FCh 80 BYTEs	default signature
+Ch 80 BYTEs	default font 10
+Ch 80 BYTEs	default font 165
+ECh 80 BYTEs	default user font
+Ch 80 BYTEs	default Pdir
+Ch 80 BYTEs	default sort
+DCh 10 BYTEs	default bill
+E6h 10 BYTEs	default route
+F0h 40 BYTEs	default cover sheet form
+h 34 BYTEs	valid dial characters
+Ah  6 BYTEs	local country code
+h  6 BYTEs	local city or area code
+h  6 BYTEs	future expansion
+Ch	WORD	structure size
+Format of STAT_IO_GET command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	device number
+Eh	WORD	current activity
+h	WORD	number of rings (if ringing)
+h	WORD	number of fascimiles transmitted
+h	WORD	number of fascimiles received
+h	WORD	status of last transmission
+h	WORD	envelope number of last transmission
+Ah	WORD	index of last destination in envelope
+Ch	WORD	status of last reception
+Eh	WORD	current page (if session in progress)
+h 80 BYTEs	current file
+h104 BYTEs	remote number
+ D8h 20 BYTEs	last name
+ ECh 20 BYTEs	first name
+h 32 BYTEs	company name
+h 32 BYTEs	notes
+h	WORD	current envelope ID (if sending)
+h	WORD	total pages in transmission (if sending)
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of STAT_FAXBIOS_GET command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	status ID
+Eh	WORD	currenty FaxBIOS function number
+h	WORD	current Client ID being serviced
+h	WORD	number of things to do
+h	WORD	number of them done
+h	WORD	number of pages to do (if any)
+h	WORD	number of them done
+Ah	WORD	number of files to do
+Ch	WORD	number of them done
+Eh 80 BYTEs	current File
+Eh	WORD	0 if all devices are idle
+h	WORD	number of fascimiles transmitted
+h	WORD	number of fascimiles received
+h	WORD	status of last transmission in system
+h	WORD	envelope ID of last transmission
+h	WORD	index of last destination in envelope
+Ah	WORD	status of last reception in system
+Ch	DWORD	time of next transmission
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of PDIR_OPEN command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch 80 BYTEs	Phone Directory token
+Ch 80 BYTEs	sort order token
+ ACh	WORD	open Mode (0 = read, 1 = write)
+ AEh	WORD	Phone Directory handle
+ B0h	WORD	number of people
+ B2h	WORD	number of groups
+ B4h	WORD	bitmap of fields supported by partial read
+ B6h  6 BYTEs	future expansion
+ BCh	WORD	structure size
+Format of PDIR_CLOSE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	Phone Directory handle
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of PDIR_READ_PERSON command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	Phone Directory handle
+Eh	WORD	retrieve by index
+h	WORD	person ID or index
+h	WORD	how many groups person is in
+h	WORD	person ID
+h 20 BYTEs	last name
+Ah 20 BYTEs	first name
+Eh 32 BYTEs	company
+Eh 32 BYTEs	notes
+Eh  6 BYTEs	FAX country code
+h  6 BYTEs	FAX city/area code
+Ah 14 BYTEs	FAX local number
+h 14 BYTEs	FAX extension
+ A6h 24 BYTEs	reserved
+ BEh  6 BYTEs	voice country code
+ C4h  6 BYTEs	voice city/area code
+ CAh 14 BYTEs	voice local number
+ D8h 14 BYTEs	voice extension
+ E6h 24 BYTEs	reserved
+ FEh 10 BYTEs	outbound routing information
+h 10 BYTEs	billing information, credit card etc
+h	DWORD	remote FAX capabilities
+h 21 BYTEs	T.30 poll code of FAX number
+Bh 15 BYTEs	reserved
+Ah  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SCHED_OPEN, SCHED_CANCEL command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	scheduler handle
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SCHED_ADD_DEST command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	schedule handle
+Eh	WORD	device number if manual send wanted
+h	WORD	non-zero if poll desired
+h	WORD	person ID
+h 20 BYTEs	last name
+h 20 BYTEs	first name
+Ch 32 BYTEs	company
+Ch 32 BYTEs	notes
+Ch  6 BYTEs	FAX country code
+h  6 BYTEs	FAX city/area code
+h 14 BYTEs	FAX local number
+h 14 BYTEs	FAX extension
+ A4h 24 BYTEs	reserved
+ BCh  6 BYTEs	voice country code
+ C2h  6 BYTEs	voice city/area code
+ C8h 14 BYTEs	voice local number
+ D6h 14 BYTEs	voice extension
+ E4h 24 BYTEs	reserved
+ FCh 10 BYTEs	outbound routing information
+h 10 BYTEs	billing information, credit card etc
+h	DWORD	remote FAX capabilities
+h 21 BYTEs	T.30 poll code of FAX number
+h 15 BYTEs	reserved
+h  6 BYTEs	future expansion
+Eh	WORD	structure size
+Format of SCHED_ADD_FILE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	schedule handle
+Eh	WORD	file type
+h unidentified
+h native file format
+h ASCII
+h FaxBIOS Tiff Class F
+h 80 BYTEs	file name
+h 80 BYTEs	font token
+ B0h	WORD	conversion options bitmap
+ B2h	WORD	resolution
+h standard 98 lines per inch, 204 dpi
+h fine 196 lines per inch, 204 dpi
+h Group4 300 dpi
+h Group4 400 dpi
+ B4h	WORD	page length
+h 279 mm (11 in)
+h 297 mm (11.69 in)
+h 364 mm (14.33 in)
+h unlimited
+ B6h	WORD	page width
+h 215 mm (8.46 in)
+h 255 mm (10.04 in)
+h 303 mm (11.93 in)
+h 151 mm (5.91 in)
+h 107 mm (4.21 in)
+ B8h	WORD	binary file transfer specification
+h only as FAX
+h only as file (for non-faxable files)
+h as file when possible else FAX
+ BAh	WORD	seam flag (nonzero for seam with next)
+ BCh	WORD	delete flag (nonzero to delete when done)
+ BEh  6 BYTEs	future expansion
+ C4h	WORD	structure size
+Format of SCHED_SET_PARAMS command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	scheduler handle
+Eh	DWORD	time to send
+h 10 BYTEs	priority token
+Ch 80 BYTEs	logo file token
+Ch 80 BYTEs	signature file token
+ BCh 80 BYTEs	cover page token
+Ch 40 BYTEs	Subject text
+h 40 BYTEs	From text
+Ch	WORD	user ID
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SCHED_CLOSE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	scheduler handle
+Eh	WORD	envelope ID generated
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of SLOG_OPEN, SLOG_CLOSE, RLOG_OPEN, RLOG_CLOSE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	log handle
+Eh	WORD	number of entries
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_GET_FILE_TYPE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch 80 BYTEs	filename
+Ch	WORD	file type
+h unidentified
+h native file format
+h ASCII
+h FaxBIOS Tiff Class F
+Eh	WORD	bitmap of supported capabilities
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_CREATE_FILE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch 80 BYTEs	filename
+Ch	WORD	graph handle
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_CLOSE_FILE, GRAPH_END_PAGE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	graph handle
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_CREATE_PAGE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	graph handle
+Eh	WORD	resolution
+h	WORD	page width
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_WRITE_PAGE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	graph handle
+Eh	DWORD	pointer to storage for image
+h	WORD	band height in lines
+h	WORD	width of page image in bytes
+h	WORD	facsimile page width constant
+h	WORD	width of page image in bits
+Ah	WORD	number of bytes actually processed
+Ch  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_OPEN_FILE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch 80 BYTEs	filename
+Ch	WORD	file type
+Eh	WORD	graph handle
+h	WORD	number of pages
+h  6 BYTEs	future expansion
+h	WORD	structure size
+Format of GRAPH_GOTO_PAGE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	graph handle
+Eh	WORD	page number
+h	WORD	vertical resolution
+h	WORD	page width
+h	DWORD	page length
+h  6 BYTEs	future expansion
+Eh	WORD	structure size
+Format of GRAPH_READ_PAGE command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	graph handle
+Eh	DWORD	pointer to storage for image
+h	WORD	band height in lines
+h	WORD	width of page image in bytes
+h	WORD	facsimile page width constant
+h	WORD	width of page image in bits
+Ah	WORD	number of bytes actually processed
+Ch  6 BYTEs	future expansion
+h	WORD	structure size
+Format of IOCTL_ANSWER_FAX command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	device number
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+Format of IOCTL_DIAL command buffer:
+Offset	Size	Description
+h 12 BYTEs	common data (see SYS_LOGOUT above)
+Ch	WORD	device number
+Eh  6 BYTEs	country code
+h  6 BYTEs	city or area code
+Ah 14 BYTEs	local number
+h 14 BYTEs	extension
+h 14 BYTEs	reserved
+Eh  6 BYTEs	future expansion
+h	WORD	structure size
+----------2F8100-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - INSTALLATION CHECK
+	AX = 8100h
+Return: AL = FFh if installed
+Note:	TurboNET is a NetBIOS-based file redirector and server; a demonstration
+	  version may be downloaded from Nanosoft's BBS
+SeeAlso: AX=8000h"TurboNET"
+----------2F8101-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
+	AX = 8101h
+Return: AL = ???
+	DL = ???
+----------2F8102-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
+	AX = 8102h
+Return: AL = ???
+	DL = ???
+----------2F8103-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - GET MACHINE NAME???
+	AX = 8103h
+	ES:DI -> 17-byte buffer
+Return: buffer filled
+----------2F8104-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
+	AX = 8104h
+	BL = ???
+	BH = ???
+	CX = ???
+	DX = ???
+	DS:SI -> 16-byte buffer containing ???
+Return: AL = 00h ???
+----------2F8105-----------------------------
+INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
+	AX = 8105h
+	CX = ??? (don't change current value if 0000h)
+	DX = ??? (don't change current value if 0000h)
+Return: AL = 00h successful
+----------2F82-------------------------------
+INT 2F U - Nanosoft, Inc. TurboNET - ???
+	AH = 82h
+	???
+Return: ???
+Note:	called by TNR.EXE, the TurboNET redirector configuration program
+SeeAlso: AX=8100h
+----------2F8200-----------------------------
+INT 2F - RESPLAY - SAMPLE/PLAYBACK
+	AX = 8200h
+	DX:DI -> start of sample space
+	CX:BX = length in bytes
+Return: AX = status
+h successful
+h not initialized (see AX=8210h)
+	    other RESPLAY not installed
+Note:	RESPLAY is a freeware sound sampling/playback utility by Mark J. Cox
+SeeAlso: AX=8201h,AX=8210h
+----------2F8201-----------------------------
+INT 2F - RESPLAY - INSTALLATION CHECK
+	AX = 8201h
+Return: AX = 7746h if installed
+SeeAlso: AX=8202h
+----------2F8202-----------------------------
+INT 2F - RESPLAY - UNINSTALL
+	AX = 8202h
+Return:	AX = status
+h successful
+SeeAlso: AX=8201h
+----------2F8210-----------------------------
+INT 2F - RESPLAY - INITIALIZE
+	AX = 8210h
+	BL = sound device
+h printer port LPT1
+h printer port LPT2
+h prototype board at I/O address 0300h
+h printer port (alternative LPT1)
+h internal speaker
+	BH = sample rate in multiples of 250 Hz (14h to A0h)
+	CL = direction
+h playback
+h sample
+Return: AX = status
+h successful
+h parameter out of range
+	    other RESPLAY not installed
+SeeAlso: AX=8200h
+----------2F86-------------------------------
+INT 2F U - ???
+	AH = 86h
+	AL = function (at least 06h and 07h)
+	???
+Return: ???
+Note:	called by Codeview for Windows
+SeeAlso: AH=44h
+----------2F8900-----------------------------
+INT 2F - WHOA!.COM - INSTALLATION CHECK
+	AX = 8900h
+Return: AL = 00h not installed
+	   = FFh installed
+Note:	WHOA!.COM is a system slow-down utility by Brad D Crandall
+SeeAlso: AX=8901h,AX=8902h
+----------2F8901-----------------------------
+INT 2F - WHOA!.COM - UNINSTALL
+	AX = 8901h
+Return: AL = FDh successful
+	   = FEh error
+Note:	WHOA!.COM is a system slow-down utility by Brad D Crandall
+SeeAlso: AX=8900h
+----------2F8902-----------------------------
+INT 2F - WHOA!.COM - SET DELAY COUNT
+	AX = 8902h
+	BX = delay count (larger values slow system down more)
+Return: AL = FDh successful
+	   = FEh error
+Note:	WHOA!.COM is a system slow-down utility by Brad D Crandall
+SeeAlso: AX=8900h
+----------2F9000-----------------------------
+INT 2F U - RAID - INSTALLATION CHECK
+	AX = 9000h
+Return: AL = FFh if installed
+Note:	RAID (Resident AID) is a TSR utility program by Ross Neilson Wentworth
+	  that resides mostly in EMS
+----------2F9001-----------------------------
+INT 2F U - RAID - GET ???
+	AX = 9001h
+Return: DX:AX -> ???
+SeeAlso: AX=9000h
+----------2F9002-----------------------------
+INT 2F U - RAID - GET RESIDENT SEGMENT
+	AX = 9002h
+Return: AX = segment of resident (conventional memory) portion
+SeeAlso: AX=9000h
+----------2F9003-----------------------------
+INT 2F U - RAID - UNINSTALL
+	AX = 9003h
+Return: ???
+SeeAlso: AX=9000h
+----------2F9004-----------------------------
+INT 2F U - RAID - GET ???
+	AX = 9004h
+Return: AX = first available paragraph past end of resident portion???
+	CX destroyed
+SeeAlso: AX=9000h
+----------2F92-------------------------------
+INT 2F - Couriers LAN E-Mail - API
+	AH = 92h
+	AL = function
+h installation check
+h uninstall
+h pop down MICRO.EXE notification window
+h ???
+h ???
+h ???
+Return: ???
+SeeAlso: AH=9Ch
+----------2F93-------------------------------
+INT 2F - InnerMission v1.7+ - INSTALLATION CHECK
+	AH = 93h
+	BX = CX = AX
+Return: AL = FFh if installed and BX=CX=AX on entry
+	    BX = segment of resident code
+	   = 01h if installed but BX or CX differ from AX
+Note:	InnerMission is a shareware graphical screen blanker by Kevin Stokes
+----------2F9C-------------------------------
+INT 2F - Couriers LAN E-Mail OPERATOR.EXE - API
+	AH = 9Ch
+	AL = subfunction
+h uninstall
+Return: ???
+SeeAlso: AH=92h
+----------2FA1--BX0081-----------------------
+INT 2F - Ergo DOS extenders - INSTALLATION CHECK
+	AH = A1h
+	BX = 0081h
+	AL = which
+	    FEh OS/286,OS/386
+	    FFh HummingBoard DOS extender
+	ES:DI -> 16-byte buffer
+Return: if installed, first four bytes of ES:DI buffer are "IABH"
+Note:	since TKERNEL is a licensed version, it is likely that subfunctions
+	  BX=0082h and BX=0084h are present and function identically to the
+	  AX=FBA1h/BX=008xh calls
+SeeAlso: AX=ED00h,AX=FBA1h,INT 15/AX=BF02h
+----------2FA189-----------------------------
+INT 2F U - Biologic HRAMDEV.SYS - API
+	AX = A189h
+	BX = subfunction
+h set ???
+h remove ???
+h get status ???
+h enable ???
+h disable ???
+h set ??? flag
+h clear ??? flag
+h set ??? flag
+h clear ??? flag
+h set ???
+	ES:DI -> function-specific arguments
+		if func 0000h: 20-byte buffer containing ???
+		if func 0001h: 20-byte buffer for returned ???
+		if func 0002h: 16-byte buffer for returned ???
+		if func 0009h: WORD containing ???
+Return: BX = A189h if installed
+	AH = status
+h successful
+	    FFh failed or invalid function number
+Notes:	HRAMDEV.SYS is a part of the shareware package HRAM by Biologic which
+	  provides improved high memory access under MSDOS 5.0
+	functions 00h and 01h use a stack of four entries; function 01h always
+	  removes the values stored with the most recent function 00h call
+	  which has not yet been matched with a function 01h call.
+----------2FA900-----------------------------
+INT 2F - METZTSR.COM - INSTALLATION CHECK
+	AX = A900h
+	CF set
+Return: CF clear if resident
+	    AX = 97FFh
+	CF set if not present
+Notes:	METZTSR.COM prevents METZ applications (such as the MAGIC screen
+	  saver) inactivity timeout while running a DOSapp under MS Windows.
+	the default multiplex number is A9h, but may be set to any value from
+h to FFh with a commandline switch
+SeeAlso: AX=A901h,AX=A902h
+----------2FA901-----------------------------
+INT 2F - METZTSR.COM - GET TIME OF LAST KEYBOARD ACTIVITY
+	AX = A901h
+	CF set
+Return: CF clear if successful
+	    AX:DX = BIOS time at which INT 09 was last invoked
+	CF set if not present
+SeeAlso: INT 09,INT 1A/AH=00h
+----------2FA902-----------------------------
+INT 2F - METZTSR.COM - SET METZ Ctrl-Alt-Del FLAG
+	AX = A902h
+	BL = new value
+h Ctrl-Alt-Del not allowed
+	    else Ctrl-Alt-Del allowed (startup default is 01h)
+	CF set
+Return: CF clear if successful
+	    AX = 97FFh
+	CF set if not resident
+SeeAlso: AX=A903h
+----------2FA903-----------------------------
+INT 2F - METZTSR.COM - GET METZ Ctrl-Alt-Del FLAG
+	AX = A903h
+	CF set
+Return: CF clear if successful
+	    AX = 97FFh if Ctrl-Alt-Del allowed
+	    AX = 0000h if Ctrl-Alt-Del not allowed
+	CF set if not resident
+SeeAlso: AX=A902h
+----------2FAA00-----------------------------
+INT 2F - VIDCLOCK.COM - INSTALLATION CHECK
+	AX = AA00h
+Return: AL = 00h not installed
+	     FFh installed
+Note:	VIDCLOCK.COM is a memory-resident clock by Thomas G. Hanlin III
+----------2FAB00-----------------------------
+INT 2F - Btrieve Multi-User - INSTALLATION CHECK
+	AX = AB00h
+Return: AL = 4Dh if installed
+SeeAlso: AX=AB01h,AX=AB02h,INT 21/AX=3000h"Btrieve",INT 7B"Btrieve"
+----------2FAB01-----------------------------
+INT 2F - Btrieve Multi-User - EXECUTE Btrieve OPERATION
+	AX = AB01h
+	BX = process ID
+	DS:DX -> 38-byte parameter record (see INT 7B"Btrieve")
+Return: AL = 00h OK
+	   = other retry after calling INT 7F/AX=0200h
+SeeAlso: AX=AB00h,AX=AB02h,INT 7B"Btrieve",INT 7F/AX=0200h
+----------2FAB02-----------------------------
+INT 2F - Btrieve Multi-User - GET NEW PROCESS ID
+	AX = AB02h
+Return: AL = 00h succesful
+	    BX = process ID
+	AL > 00h failed, retry after calling INT 7F/AX=0200h
+SeeAlso: AX=AB00h,AX=AB01h,INT 7B"Btrieve",INT 7F/AX=0200h
+----------2FAC00-----------------------------
+INT 2F - DOS 4.01+ GRAPHICS.COM - INSTALLATION CHECK
+	AX = AC00h
+Return: AX = FFFFh
+	ES:DI -> ??? (graphics data?) (not documented)
+Note:	this installation check was moved here to avoid the conflict with the
+	  CD-ROM extensions that occurred in DOS 4.00
+SeeAlso: AX=1500h"GRAPHICS"
+----------2FAD00-----------------------------
+INT 2F U - DOS 3.3+ DISPLAY.SYS internal - INSTALLATION CHECK
+	AX = AD00h
+Return: AL = FFh if installed
+	    BX = ??? (0100h in MS-DOS 3.30, PCDOS 4.01)
+Note:	DOS 5.0 DISPLAY.SYS chains to previous handler if AL is not one of the
+	  subfunctions listed here
+----------2FAD01-----------------------------
+INT 2F U - DOS 3.3+ DISPLAY.SYS internal - SET ???
+	AX = AD01h
+	BX = ???
+Return: ???
+	CF set on error
+----------2FAD02-----------------------------
+INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET ???
+	AX = AD02h
+Return: BX = ??? (value set with AX=AD01h)
+----------2FAD03-----------------------------
+INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET ???
+	AX = AD03h
+	ES:DI -> user buffer
+	CX = size of buffer
+Return: CF set if buffer too small
+	CF clear if successful
+----------2FAD04-----------------------------
+INT 2F U - DOS 4.x only DISPLAY.SYS internal - ???
+	AX = AD04h
+	???
+Return: ???
+----------2FAD10-----------------------------
+INT 2F U - DOS 4+ DISPLAY.SYS internal - INSTALLATION CHECK???
+	AX = AD10h
+	???
+Return: AX = FFFFh
+	BX = ??? (0100h in PCDOS 4.01)
+----------2FAD40-----------------------------
+INT 2F - DOS 4.0 - ???
+	AX = AD40h
+	DX = ???
+	???
+Return: ???
+Note:	called by PCDOS 4.01 PRINT.COM
+----------2FAD80-----------------------------
+INT 2F - DOS 3.3+ KEYB.COM internal - INSTALLATION CHECK
+	AX = AD80h
+Return: AL = FFh if installed
+	    BX = version number (BH = major, BL = minor)
+	    ES:DI -> internal data (see below)
+Note:	MSDOS 3.30, PCDOS 4.01, and MSDOS 5.00 all report version 1.00.
+Format of KEYB internal data:
+Offset	Size	Description
+h	DWORD	original INT 09
+h	DWORD	original INT 2F
+h  6 BYTEs	???
+Eh	WORD	flags
+h	BYTE	???
+h	BYTE	???
+h  4 BYTEs	???
+h  2 BYTEs	country ID letters
+h	WORD	current code page
+---DOS 3.3---
+Ah	WORD	pointer to first item in list of code page tables???
+Ch	WORD	pointer to ??? item in list of code page tables
+Eh  2 BYTEs	???
+h	WORD	pointer to key translation data
+h	WORD	pointer to last item in code page table list (see below)
+h  9 BYTEs	???
+---DOS 4.01---
+Ah  2 BYTEs	???
+Ch	WORD	pointer to first item in list of code page tables???
+Eh	WORD	pointer to ??? item in list of code page tables
+h  2 BYTEs	???
+h	WORD	pointer to key translation data
+h	WORD	pointer to last item in code page table list (see below)
+h  9 BYTEs	???
+Format of code page table list entries:
+Offset	Size	Description
+h	WORD	pointer to next item, FFFFh = last
+h	WORD	code page
+h  2 BYTEs	???
+Format of translation data:
+Offset	Size	Description
+h	WORD	size of data in bytes, including this word
+h N-2 BYTEs	???
+----------2FAD81-----------------------------
+INT 2F - DOS 3.3+ KEYB.COM - SET KEYBOARD CODE PAGE
+	AX = AD81h
+	BX = code page (see INT 21/AX=6601h)
+Return: CF set on error
+	    AX = 0001h (code page not available)
+	CF clear if successful
+Notes:	called by DISPLAY.SYS
+	documented for DOS 5+, but undocumented for earlier versions
+SeeAlso: AX=AD82h
+----------2FAD82-----------------------------
+INT 2F - DOS 3.3+ KEYB.COM - SET KEYBOARD MAPPING
+	AX = AD82h
+	BL = new state
+h US keyboard (Control-Alt-F1)
+	    FFh foreign keyboard (Control-Alt-F2)
+Return: CF set on error (BL not 00h or FFh)
+	CF clear if successful
+Note:	documented for DOS 5+, but undocumented for earlier versions
+SeeAlso: AX=AD81h,AX=AD83h
+----------2FAD83-----------------------------
+INT 2F - DOS 5.0 KEYB.COM - GET KEYBOARD MAPPING
+	AX = AD83h
+Return: BL = current state
+h US keyboard
+	    FFh foreign keyboard
+SeeAlso: AX=AD82h
+----------2FAE00DXFFFF-----------------------
+INT 2F U - DOS 3.3+ internal - INSTALLABLE COMMAND - INSTALLATION CHECK
+	AX = AE00h
+	DX = FFFFh
+	CH = FFh
+	CL = length of command line tail (4DOS v4.0)
+	DS:BX -> command line buffer (see below)
+	DS:SI -> command name buffer (see below)
+	DI = 0000h (4DOS v4.0)
+Return: AL = FFh if this command is a TSR extension to COMMAND.COM
+	AL = 00h if the command should be executed as usual
+Notes:	This call provides a mechanism for TSRs to install permanent
+	  extensions to the command repertoire of COMMAND.COM.	It appears
+	  that COMMAND.COM makes this call before executing the current
+	  command line, and does not execute it itself if the return is FFh.
+	APPEND hooks this call, to allow subsequent APPEND commands to
+	  execute without re-running APPEND
+Format of command line buffer:
+Offset	Size	Description
+h	BYTE	max length of command line, as in INT 21/AH=0Ah
+h	BYTE	count of bytes to follow, excluding terminating 0Dh
+      N BYTEs	command line text, terminated by 0Dh
+Format of command name buffer:
+Offset	Size	Description
+h	BYTE	length of command name
+h  N BYTEs	uppercased command name (blank-padded to 11 chars by 4DOS v4)
+----------2FAE01DXFFFF-----------------------
+INT 2F U - DOS 3.3+ internal - INSTALLABLE COMMAND - EXECUTE
+	AX = AE01h
+	DX = FFFFh
+	CH = 00h
+	CL = length of command name (4DOS v4.0)
+	DS:SI -> command name buffer (see AX=AE00h)
+	DS:BX -> command line buffer (see AX=AE00h)
+Return: DS:SI buffer updated
+	  if length byte is nonzero, the following bytes contain the uppercase
+	  internal command to execute and the command line buffer contains the
+	  command's parameters (the first DS:[SI] bytes are ignored)
+Notes:	this call requests execution of the command which a previous call to
+	  AX=AE00h indicated was resident
+	APPEND hooks this call
+----------2FB000-----------------------------
+INT 2F - DOS 3.3+ GRAFTABL.COM - INSTALLATION CHECK
+	AX = B000h
+Return: AL = 00h not installed, OK to install
+	   = 01h not installed, not OK to install
+	   = FFh installed
+Notes:	called by DISPLAY.SYS
+	documented for DOS 5.0, but undocumented in prior versions
+SeeAlso: AX=B001h
+----------2FB001-----------------------------
+INT 2F - DOS 3.3+ GRAFTABL.COM - GET GRAPHICS FONT TABLE
+	AX = B001h
+	DS:BX -> DWORD buffer for address of 8x8 font table
+Return: buffer filled
+	AL = FFh
+Note:	PCDOS 3.30/4.01 set the font table offset to 0130h, MSDOS 3.30 to 0030h
+SeeAlso: AX=B000h
+----------2FB400-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - INSTALLATION CHECK
+	AX = B400h
+Return: AL = FFh if installed
+----------2FB401-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - GET HOST BUFFER ADDRESS
+	AX = B401h
+Return: ES -> host screen buffer (PC ASCII format)
+	ES unchanged if communications not started
+----------2FB402-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - ???
+	AX = B402h
+	BX = ???
+Return: ???
+----------2FB403-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - ???
+	AX = B403h
+	???
+Return: ???
+----------2FB404-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - ???
+	AX = B404h
+	???
+Return: ???
+----------2FB405-----------------------------
+INT 2F - IBM PC3270 EMULATION PROG v3 - ???
+	AX = B405h
+	???
+Return: ???
+----------2FB700-----------------------------
+INT 2F - APPEND - INSTALLATION CHECK
+	AX = B700h
+Return: AL = status
+h not installed
+	    FFh installed
+Note:	MSDOS 3.30 APPEND refuses to install itself when run inside TopView or
+	  a TopView-compatible environment
+----------2FB701-----------------------------
+INT 2F U - APPEND - ???
+	AX = B701h
+	???
+Return: ???
+Note:	MSDOS 3.30 APPEND displays "Incorrect APPEND Version" and aborts caller
+----------2FB702-----------------------------
+INT 2F - APPEND - VERSION CHECK
+	AX = B702h
+Return: AX = FFFFh if not DOS 4.0 APPEND (also if DOS 5.0 APPEND)
+	AL = major version number
+	AH = minor version number, otherwise
+SeeAlso: AX=B710h
+----------2FB703-----------------------------
+INT 2F U - DOS 3.3, DOS 5.0 APPEND - HOOK INT 21
+	AX = B703h
+	ES:DI -> INT 21 handler APPEND should chain to
+Return: ES:DI -> APPEND's INT 21 handler
+Note:	each invocation of this function toggles a flag which APPEND uses to
+	  determine whether to chain to the user handler or the original
+	  INT 21
+----------2FB704-----------------------------
+INT 2F - DOS 3.3+ APPEND - GET APPEND PATH
+	AX = B704h
+Return: ES:DI -> active APPEND path (128 bytes max)
+----------2FB706-----------------------------
+INT 2F - DOS 4+ APPEND - GET APPEND FUNCTION STATE
+	AX = B706h
+Return: BX = APPEND state
+	    bit 0: set if APPEND enabled
+	    bits 1-11 reserved
+	    bit 12: (DOS 5.0) set if APPEND applies directory search even if a
+			drive has been specified
+	    bit 13: set if /PATH flag active
+	    bit 14: set if /E flag active (environment var APPEND exists)
+	    bit 15: set if /X flag active
+----------2FB707-----------------------------
+INT 2F - DOS 4+ APPEND - SET APPEND FUNCTION STATE
+	AX = B707h
+	BX = APPEND state bits (see AX=B706h)
+----------2FB710-----------------------------
+INT 2F U - DOS 3.3+ APPEND - GET VERSION INFO
+	AX = B710h
+Return: AX = current APPEND state (see AX=B706h)
+	BX = ??? (0000h in MSDOS 3.30 and 5.00)
+	CX = ??? (0000h in MSDOS 3.30 and 5.00)
+	DL = major version
+	DH = minor version
+SeeAlso: AX=B702h
+----------2FB711-----------------------------
+INT 2F - DOS 4+ APPEND - SET RETURN FOUND NAME STATE
+	AX = B711h
+Note:	if the next INT 21h call (and ONLY the next) is function 3Dh, 43h, or
+Ch (also 4B03h and 4Eh if /X active), the fully qualified filename is
+	written over top of the filename passed to the INT 21h call.  The
+	application must provide a sufficiently large buffer.  This state is
+	reset after the next INT 21h call processed by APPEND.
+BUG:	DOS 4.0 APPEND reportedly overwrites DS:DX instead of DS:SI for
+	  INT 21/AH=6Ch
+SeeAlso: INT 21/AH=4Eh
+----------2FB800-----------------------------
+INT 2F - network - INSTALLATION CHECK
+	AX = B800h
+Return: AL = status
+h	    not installed
+	    nonzero installed
+	      BX = installed component flags (test in this order!)
+		   bit 6   server
+		   bit 2   messenger
+		   bit 7   receiver
+		   bit 3   redirector
+----------2FB803-----------------------------
+INT 2F - network - GET NETWORK EVENT POST HANDLER
+	AX = B803h
+Return: ES:BX -> event post handler (see AX=B804h)
+SeeAlso: AX=B804h,AX=B903h
+----------2FB804-----------------------------
+INT 2F - network - SET NETWORK EVENT POST HANDLER
+	AX = B804h
+	ES:BX -> new event post handler
+Notes:	used in conjunction with AX=B803h to hook into the network event post
+	  routine
+	The specified handler is called on any network event.  Two events are
+	  defined: message received and critical network error.
+SeeAlso: AX=B803h,AX=B904h
+Values post routine is called with:
+	AX = 0000h single block message
+	    DS:SI -> ASCIZ originator name
+	    DS:DI -> ASCIZ destination name
+	    ES:BX -> text header (see below)
+	AX = 0001h start multiple message block
+	    CX = block group ID
+	    DS:SI -> ASCIZ originator name
+	    DS:DI -> ASCIZ destination name
+	AX = 0002h multiple block text
+	    CX = block group ID
+	    ES:BX -> text header (see below)
+	AX = 0003h end multiple block message
+	    CX = block group ID
+	AX = 0004h message aborted due to error
+	    CX = block group ID
+	AX = 0101h server received badly formatted network request
+	    Return: AX = FFFFh (PC LAN will process error)
+	AX = 0102h unexpected network error
+	    ES:BX -> NCB (see INT 5C)
+	AX = 0103h server received INT 24 error
+	    other registers as for INT 24, except AH is in BH
+	    Return: as below, but only 0000h and FFFFh allowed
+Return:	AX = response code
+h user post routine processed message
+h PC LAN will process message, but message window not displayed
+	    FFFFh PC LAN will process message
+Format of text header:
+Offset	Size	Description
+h	WORD	length of text (maximum 512 bytes)
+h  N BYTEs	text of message
+Note:	all CRLF sequences in message text are replaced by 14h
+----------2FB807-----------------------------
+INT 2F - Network - GET NetBIOS NAME NUMBER OF MACHINE NAME
+	AX = B807h
+Return: CH = NetBIOS name number of the machine name
+SeeAlso: INT 21/AX=5E00h
+----------2FB808-----------------------------
+INT 2F U - Network - RELINK KEYBOARD HANDLER
+	AX = B908h
+	ES:BX -> INT 09 handler RECEIVER should call after it finishes INT 09
+Notes:	this call replaces the address to which RECEIVER.COM chains on an
+	  INT 09 without preserving the original value.	 This allows a prior
+	  handler to unlink, but does not allow a new handler to be added
+	  such that RECEIVER gets the INT 09 first unless it completely takes
+	  over INT 09 and never chains.
+	called by DOS 3.2 KEYBxx.COM
+SeeAlso: AX=B908h
+----------2FB809-----------------------------
+INT 2F - LANtastic Network, NetWare Lite - VERSION CHECK
+	AX = B809h
+Return: AH = major version
+	AL = minor version (decimal)
+----------2FB900-----------------------------
+INT 2F - PC Network RECEIVER.COM - INSTALLATION CHECK
+	AX = B900h
+Return: AL = 00h if not installed
+	     FFh if installed
+----------2FB901-----------------------------
+INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM INT 2F HANDLER ADDRESS
+	AX = B901h
+Return: AL = ???
+	ES:BX -> RECEIVER.COM INT 2F handler
+Note:	allows more efficient execution by letting the caller bypass any other
+	  INT 2F handlers which have been added since RECEIVER.COM was
+	  installed
+----------2FB903-----------------------------
+INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM POST ADDRESS
+	AX = B903h
+Return: ES:BX -> POST handler
+SeeAlso: AX=B803h,AX=B904h
+----------2FB904-----------------------------
+INT 2F - PC Network RECEIVER.COM - SET RECEIVER.COM POST ADDRESS
+	AX = B904h
+	ES:BX -> new POST handler
+SeeAlso: AX=B804h,AX=B903h
+----------2FB905-----------------------------
+INT 2F - PC Network RECEIVER.COM - GET FILENAME
+	AX = B905h
+	DS:BX -> 128-byte buffer for filename 1
+	DS:DX -> 128-byte buffer for filename 2
+Return: buffers filled from RECEIVER.COM internal buffers
+Note:	use of filenames is unknown, but one appears to be for storing messages
+SeeAlso: AX=B906h
+----------2FB906-----------------------------
+INT 2F - PC Network RECEIVER.COM - SET FILENAME
+	AX = B906h
+	DS:BX -> 128-byte buffer for filename 1
+	DS:DX -> 128-byte buffer for filename 2
+Return: RECEIVER.COM internal buffers filled from user buffers
+Note:	use of filenames is unknown, but one appears to be for storing messages
+SeeAlso: AX=B905h
+----------2FB908-----------------------------
+INT 2F - PC Network RECEIVER.COM - UNLINK KEYBOARD HANDLER
+	AX = B908h
+	ES:BX -> INT 09 handler RECEIVER should call after it finishes INT 09
+Note:	this call replaces the address to which RECEIVER.COM chains on an
+	  INT 09 without preserving the original value.	 This allows a prior
+	  handler to unlink, but does not allow a new handler to be added
+	  such that RECEIVER gets the INT 09 first.
+SeeAlso: AX=B808h
+----------2FBC00-----------------------------
+INT 2F - Windows 3.0, DOS 5.0 EGA.SYS - INSTALLATION CHECK
+	AX = BC00h
+Return: AL = 00h not installed, OK to install
+	   = 01h not installed, not OK to install
+	   = FFh installed
+		BX = 5456h ("TV")
+Note:	AH=BCh is the default value, which may be changed by a command line
+	  parameter to any value between 80h and FFh
+SeeAlso: AX=BC06h,INT 10/AH=FAh"EGA"
+----------2FBC06-----------------------------
+INT 2F U - MS Windows 3.0, DOS 5.0 EGA.SYS - GET VERSION INFO
+	AX = BC06h
+Return: BX = 5456h ("TV")
+	CH = major version
+	CL = minor version
+	DL = revision
+SeeAlso: AX=BC00h,INT 10/AH=FAh"EGA"
+----------2FBE00-----------------------------
+INT 2F - REDVIEW - INSTALLATION CHECK
+	AX = BE00h
+Return: AL = FFh if installed
+Note:	REDVIEW is a public-domain TSR by Alexandr Novy and Petr Horak which
+	  copies data sent to standard output to standard error when the
+	  former has been redirected to a file, thus allowing the data to
+	  be seen on the screen at the same time it is captured in a file
+----------2FBF00-----------------------------
+INT 2F - PC LAN PROGRAM REDIRIFS.EXE internal - INSTALLATION CHECK
+	AX = BF00h
+Return: AL = FFh if installed
+----------2FBF01-----------------------------
+INT 2F U - PC LAN PROGRAM REDIRIFS.EXE internal - ???
+	AX = BF01h
+	???
+Return: ???
+----------2FBF80-----------------------------
+INT 2F - PC LAN PROG REDIR.SYS internal - SET REDIRIFS ENTRY POINT
+	AX = BF80h
+	ES:DI -> FAR entry point to IFS handler in REDIRIFS
+Return: AL = FFh if installed
+	    ES:DI -> internal workspace
+Note:	all future IFS calls to REDIR.SYS are passed to the ES:DI entry point
+----------2FC000-----------------------------
+INT 2F - Novell ODI Link Support Layer (LSL.COM) - INSTALLATION CHECK
+	AX = C000h
+Return: AL = FFh
+	ES:BX -> call entry point
+	ES:SI -> signature string "LINKSUP$"
+Note:	LSL.COM may use any multiplex number between C0h and FFh; it searches
+	  for itself in that range, and installs using the first free multiplex
+	  number in the range if not already loaded.
+----------2FC050-----------------------------
+INT 2F U - Explosiv 2.00 - INSTALLATION CHECK
+	AX = C050h
+Return: AL = 51h if installed
+Notes:	Explosiv is a shareware animated screen blanker for DOS and Windows 3
+	  by Reidar Gresseth and Chris Hook
+	AH=C0h is the default multiplex number, but may be reconfigured to
+	  any value from C0h to C9h
+SeeAlso: AX=C051h
+----------2FC052-----------------------------
+INT 2F U - Explosiv 2.00 - UNINSTALL
+	AX = C052h
+	DX:BX = address to return to on successful uninstall
+Return: at specified address if successful
+	AL = 53h on error
+Note:	specified return address must have the segment of the caller's PSP
+SeeAlso: AX=C050h
+----------2FC054-----------------------------
+INT 2F U - Explosiv 2.00 - GET ???
+	AX = C054h
+Return: AL = ???
+Note:	returns value set by AX=C057h
+SeeAlso: AX=C057h
+----------2FC055-----------------------------
+INT 2F U - Explosiv 2.00 - SET BLANKING INTERVAL
+	AX = C055h
+	BX = new interval in clock ticks
+----------2FC056-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C056h
+	BL = ???
+----------2FC057-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C057h
+	BL = ???
+SeeAlso: AX=C054h
+----------2FC058-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C058h
+	BL = ???
+----------2FC059-----------------------------
+INT 2F U - Explosiv 2.00 - CLEAR ???
+	AX = C059h
+Note:	clears flag set by AX=C05Ah
+SeeAlso: AX=C05Ah
+----------2FC05A-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C05Ah
+	BL = ???
+Note:	sets flag cleared by AX=C059h then stores BL
+SeeAlso: AX=C059h
+----------2FC05B-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C05Bh
+	BL = ???
+----------2FC05C-----------------------------
+INT 2F U - Explosiv 2.00 - SET ???
+	AX = C05Ch
+	BL = ???
+----------2FC900BP0000-----------------------
+INT 2F U - ThunderByte??? - INSTALLATION CHECK
+	AX = C900h
+	BP = 0000h
+Return: AL = FFh if installed
+	    BP >= 0014h
+Note:	called by TBSCANX
+SeeAlso: AX=C987h,AX=CA00h
+----------2FC987-----------------------------
+INT 2F U - ThunderByte??? - DISINFECT FILE???
+	AX = C987h
+	BX:DX -> filename
+	BX:CX -> virus name
+Return: AX = status
+h successful???
+Note:	called by TBSCANX
+SeeAlso: AX=CA00h
+----------2FC9FF-----------------------------
+INT 2F - STACKMAN - INSTALLATION BROADCAST
+	AX = C9FFh
+	BL = BCD version number
+	CX = number of stacks
+	DX = stack size in bytes
+Notes:	called by STACKMAN when it goes resident to inform interested TSRs that
+	  its API is available
+	the installation check consists of testing for the string "STACKXXX" at
+	  offset 0Ah from the INT B4 handler
+SeeAlso: INT B4"STACKMAN",INT B5"STACKMAN"
+----------2FCA00BX5442-----------------------
+INT 2F - TBSCANX - INSTALLATION CHECK
+	AX = CA00h
+	BX = 5442h ('TB')
+Return:	AL = 00h not installed
+	   = FFh installed
+		BX = 7462h ('tb') if BX was 5442h on entry
+Note:	TBSCANX is a resident virus scanning module by Frans Veldman.  Programs
+	  may perform virus checks on themselves, other program files, or their
+	  data files by invoking the TBSCANX API.
+SeeAlso: AX=4653h,AX=C900h
+----------2FCA01-----------------------------
+INT 2F - TBSCANX - GET STATUS
+	AX = CA01h
+Return: AH = BCD version number (v2.2+)
+	   = CAh for versions before 2.2
+	AL = state (00h = disabled, 01h = enabled)
+	CX = number of signatures which will be searched
+---v2.0---
+	BX = EMS handle, 0000h if not using EMS
+---v2.3+---
+	BX = segment of swap area, 0000h if not swapped
+	DX = EMS or XMS handle (XMS handle if BX=0000h), FFFFh if not using EMS
+SeeAlso: AX=CA02h
+----------2FCA02-----------------------------
+INT 2F - TBSCANX - SET STATE
+	AX = CA02h
+	BL = new state (00h = disabled, 01h = enabled)
+SeeAlso: AX=CA01h
+----------2FCA03-----------------------------
+INT 2F - TBSCANX - SCAN BUFFER
+	AX = CA03h
+	CX = size of buffer
+	DS:DX -> buffer containing data to scan
+Return: CF clear if no virus signatures found
+	    BX,ES destroyed
+	CF set if signature found
+	    ES:BX -> ASCIZ virus name (v2.3+)
+	    DS:DX -> ASCIZ virus name (v2.0)
+	AX,CX,DX destroyed (v2.3+)
+	all other registers except CS:IP and SS:SP destroyed (v2.0)
+SeeAlso: AX=CA04h
+----------2FCA04-----------------------------
+INT 2F - TBSCANX - SCAN FILE
+	AX = CA04h
+	DS:DX -> filename
+Return: CF clear if no virus signatures found
+	    BX,ES destroyed
+	CF set if signature found
+	    ES:BX -> ASCIZ virus name
+	AX,CX,DX destroyed
+Note:	this function requires at least 4K free memory
+SeeAlso: AX=CA03h
+----------2FCAFEBX0000-----------------------
+INT 2F U - THELP v3.0 - INSTALLATION CHECK
+	AX = CAFEh
+	BX = 0000h
+Return: BX = segment of resident code if installed
+	   = 0000h if not installed
+SeeAlso: AX=5453h
+----------2FCB00-----------------------------
+INT 2F - Communicating Applications Specification - INSTALLATION CHECK
+	AX = CB00h
+Return: AL = 00h not installed, OK to install
+h not installed, not OK to install
+	     FFh installed
+Note:	AH = CBh is the default identifier, but may be reconfigured
+SeeAlso: AH=2Ah,AX=8000h"FaxBIOS",AX=CB0Eh,AX=CBDCh
+----------2FCB01-----------------------------
+INT 2F - Communicating Applications Specification - SUBMIT A TASK
+	AX = CB01h
+	DS:DX -> ASCIZ name of task control file
+Return: AX >= 0: event handle
+	   < 0: error code
+Note:	files needed for an event must be kept until task is complete or error
+SeeAlso: AX=CB0Bh,AX=CB15h
+Error codes (AH = class, AL = subcode, value passed back is 2's complement):
+  Class 00h	--- FAX warnings
+	Subcode 00h	no error
+h	bad scanline count
+h	page sent with errors, could not retransmit
+h	received data lost
+h	invalid or missing logo file
+h	filename does not match nonstandard format (NSF) header
+h	file size does not match NSF header
+  Class 01h	--- DOS warnings (data was sent)
+	Subcode 01h	invalid function
+h	access denied
+h	invalid handle
+		others	see INT 21/AH=59h
+  Class 02h	--- fatal errors (data not sent)
+	Subcode	00h	multiplex handler failed
+h	unknown command
+h	bad event handle
+h	FIND NEXT attempted before FIND FIRST
+h	no more events
+h	invalid queue type
+h	bad control file
+h	communication board busy
+Ah	invalid command parameter
+Bh	can't uninstall resident code
+Ch	file exists
+h	unknown task type
+h	bad phone number
+h	bad .PCX file header
+h	unexpected EOF
+h	unexpected disconnect
+h	too many dialing retries
+h	no file specified for send
+h	communication board timeout
+h	received too many pages (>1023) of data
+h	manual connect initiated too long ago
+Ah	hardware command set error
+Bh	bad NonStandard Format (NSF) header file
+  Class 03h	--- fatal DOS errors
+	Subcode 02h	file not found
+h	path not found
+		others	see INT 21/AH=59h
+  Class 04h	--- FAX errors
+	Subcode 01h	remote unit not Group 3 compatible
+h	remote unit did not send capabilities
+h	other FAX machine incompatible
+h	other FAX incapable of file transfers
+h	exceeded retrain or FAX resend limit
+h	line noise or failure to agree on bit rate
+h	remote disconnected after receiving data
+h	no response from remote after sending data
+h	remote's capabilities incompatible
+Ah	no dial tone (v1.2+)
+Bh	invalid response from remote unit after sending data
+Dh	phone line dead or remote unit disconnected
+Eh	timeout while waiting for secondary dial tone (v1.2+)
+h	invalid command from remote after receiving data
+h	tried to receive from incompatible hardware
+Ch	received data overflowed input buffer
+Dh	remote unexpectedly stopped sending data
+Eh	other FAX machine jammed (no data sent)
+Fh	remote took too long to send fax scan line
+h	can't get through to remote unit
+h	user canceled event
+  Class 05h	--- application-specific (v1.2+)
+  ---Intel FAXPOP.EXE
+	Subcode 00h	tried to send while in graphics mode
+h	insufficient disk space
+h	internal buffer overflow
+  Class 06h	--- CAS implementation-specific (v1.2+)
+----------2FCB02-----------------------------
+INT 2F - Communicating Applications Specification - ABORT CURRENT EVENT
+	AX = CB02h
+Return: AX >= 0: event handle of aborted event
+	   < 0: error code (see AX=CB01h)
+Note:	termination could take up to 30 seconds
+SeeAlso: AX=CB08h,AX=CB10h
+----------2FCB05-----------------------------
+INT 2F - Communicating Applications Specification - FIND FIRST QUEUE ENTRY
+	AX = CB05h
+	CX = status of events to find
+h successful completion
+h waiting to be processed
+h number has been dialed
+h connection established, sending
+h connection established, receiving
+h event aborted
+	    FFFFh find any event, regardless of status
+	    other negative values, match error code
+	DH = direction
+h chronological order, earliest to latest
+h reverse chronological order, latest to earliest
+	DL = queue to search
+h task queue
+h receive queue
+h log queue
+Return: AX = 0000h successful
+	    BX = event handle for found event
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB06h,AX=CB07h
+----------2FCB06-----------------------------
+INT 2F - Communicating Applications Specification - FIND NEXT QUEUE ENTRY
+	AX = CB06h
+	DL = queue to search
+h task queue
+h receive queue
+h log queue
+Return: AX = 0000h successful
+	    BX = event handle for found event
+	   < 0	   error code (see AX=CB01h)
+Note:	direction of search is same as preceding FIND FIRST call
+SeeAlso: AX=CB05h
+----------2FCB07-----------------------------
+INT 2F - Communicating Applications Specification - OPEN FILE
+	AX = CB07h
+	BX = event handle from find (AL=05h,06h) or submit task (AL=01h)
+	CX = receive file number (ignored for task queue and log queue)
+h  open receive control file
+	    N	   open Nth received data file
+	DL = queue
+h task queue
+h receive queue control file or received file, as given by CX
+h log queue
+h group file in task queue (v1.2+)
+h group file in log queue (v1.2+)
+Return: AX = 0000h successful
+	    BX = DOS file handle for requested file
+	   < 0	   error code (see AX=CB01h)
+Note:	the returned file handle has been opened in read-only mode and should
+	  be closed with INT 21/AH=3Eh after use
+SeeAlso: AX=CB01h,AX=CB05h,AX=CB14h
+----------2FCB08-----------------------------
+INT 2F - Communicating Applications Specification - DELETE FILE
+	AX = CB08h
+	BX = event handle
+	CX = receive file number
+h delete ALL received files and receive control file
+	    N	  delete Nth received file
+	DL = queue
+h delete control file in task queue and corresponding group file
+		if it exists
+h delete file in receive queue, as given by CX
+h delete control file in log queue (individual deletions not
+		recommended, to maintain integrity of log) and corresponding
+		group file if it exists
+Return: AX = 0000h successful
+	   < 0	   error code (see AX=CB01h)\
+SeeAlso: AX=CB02h,AX=CB09h
+----------2FCB09-----------------------------
+INT 2F - Communicating Applications Specification - DELETE ALL FILES IN Q
+	AX = CB09h
+	DL = queue
+h delete all control files in task queue, including all group
+		files
+h delete all files in receive queue
+h delete all control files in log queue, including all group
+		files
+Return: AX = 0000h successful
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB08h
+----------2FCB0A-----------------------------
+INT 2F - Communicating Applications Specification - GET EVENT DATE
+	AX = CB0Ah
+	BX = event handle
+	DL = queue
+h task queue
+h receive queue
+h log queue
+Return: AX = 0000h successful
+		CX = year
+		DH = month
+		DL = day
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB0Bh,AX=CB0Ch
+----------2FCB0B-----------------------------
+INT 2F - Communicating Applications Specification - SET TASK DATE
+	AX = CB0Bh
+	BX = event handle (task event only)
+	CX = year
+	DH = month
+	DL = day
+Return: AX = 0000h successful
+	   < 0	   error code (see AX=CB01h)
+Note:	setting a task's date and time to before the current date and time
+	  causes it to execute immediately
+SeeAlso: AX=CB01h,AX=CB0Ah,AX=CB0Dh
+----------2FCB0C-----------------------------
+INT 2F - Communicating Applications Specification - GET EVENT TIME
+	AX = CB0Ch
+	BX = event handle
+	DL = queue
+h task queue
+h receive queue
+h log queue
+Return: AX = 0000h successful
+		CH = hour
+		CL = minute
+		DH = second
+		DL = 00h
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB0Ah,AX=CB0Dh
+----------2FCB0D-----------------------------
+INT 2F - Communicating Applications Specification - SET TASK TIME
+	AX = CB0Dh
+	BX = event handle (task events only)
+	CH = hour
+	CL = minute
+	DH = second
+	DL unused
+Return: AX = 0000h successful
+	   < 0	   error code (see AX=CB01h)
+Note:	setting a task's date and time to before the current date and time
+	  causes it to execute immediately
+SeeAlso: AX=CB0Bh,AX=CB0Ch,AX=CB10h
+----------2FCB0E-----------------------------
+INT 2F - Communicating Applications Specification - GET EXTERNAL DATA BLOCK
+	AX = CB0Eh
+	DS:DX -> 256-byte buffer
+Return: AX = 0000h successful
+		buffer filled
+	   < 0	   error code (see AX=CB01h)
+Format of external data block:
+Offset	Size	Description
+h	BYTE	CAS major version
+h	BYTE	CAS minor version
+h 68 BYTEs	ASCIZ path to directory containing CAS software, ends in slash
+h 13 BYTEs	ASCIZ name of current phonebook (in CAS directory)
+h 13 BYTEs	ASCIZ name of current logo file (in CAS directory)
+h 32 BYTEs	ASCIZ default sender name
+h 21 BYTEs	ASCIZ CCITT identification of fax device
+h 107 BYTEs	reserved
+----------2FCB0F-----------------------------
+INT 2F - Communicating Applications Specification - GET/SET AUTORECEIVE
+	AX = CB0Fh
+	DL = subfunction
+h get current autoreceive state
+h set autoreceive state
+		DH = number of rings before answer, 00h = never
+Return: AX = 0000h autoreceive disabled
+	   = N	   number of rings before answer
+	   < 0	   error code (see AX=CB01h)
+----------2FCB10-----------------------------
+INT 2F - Communicating Applications Specification - GET CURRENT EVENT STATUS
+	AX = CB10h
+	DS:DX -> 512-byte buffer
+Return: AX = 0000h successful
+		BX = event handle of current event or negative error code if
+			no current event
+		buffer filled
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB02h,AX=CB0Dh
+Format of status area:
+Offset	Size	Description
+h	BYTE	event type
+h send
+h receive
+h polled send
+h polled receive
+h to 7Fh reserved
+		FFh serious hardware error
+h	BYTE	transfer type
+h 200x200 dpi, FAX mode
+h 100x200 dpi, FAX mode
+h file transfer mode
+h to 7Fh reserved
+h	WORD	event status
+h completed successfully
+h waiting
+h number dialed
+h connected, sending
+h connected, receiving
+h aborted
+h to 007Fh reserved
+h to 7FFFh application-specific events
+h to FFFFh error codes
+h	WORD	event time (packed DOS time format, see INT 21/AX=5700h)
+h	WORD	event date (packed DOS date format, see INT 21/AX=5700h)
+h	WORD	number of files to transfer, max 7FFFh
+Ah	WORD	offset of file transfer record
+Ch 47 BYTEs	ASCIZ phone number to call
+Bh 64 BYTEs	ASCIZ application-specific tag string
+Bh	BYTE	reserved (00h)
+Ch	BYTE	connect time, seconds
+Dh	BYTE	connect time, minutes
+Eh	BYTE	connect time, hours
+Fh	DWORD	total number of pages in all files
+h	DWORD	pages already transmitted
+h	WORD	number of files already transmitted
+h	BYTE	cover page flag
+h don't transmit cover page
+h transmit cover page
+h to 7Fh reserved
+Ah	WORD	total number of transmission errors
+Ch 78 BYTEs	reserved (zeros)
+ DAh 21 BYTEs	ASCIZ remote FAX's CCITT identification
+ EFH 32 BYTEs	ASCIZ destination name
+Fh 32 BYTEs	ASCIZ sender name
+Fh 80 BYTEs	filename of PCX logo file (max 1780x800 pixels)
+Fh 128 BYTEs	file transfer record for current event (see below)
+Format of file transfer record:
+Offset	Size	Description
+h	BYTE	file type (ignored unless FAX)
+h ASCII
+h PCX
+h DCX
+h to 7Fh reserved
+h	BYTE	text size for ASCII FAX file
+h = 80 columns by 66 lines (11 inches)
+h = 132 columns by 88 lines (11 inches)
+h to 7Fh reserved
+h	BYTE	status of file
+h untouched
+h opened
+h moved
+h deleted
+h not yet received
+h to 7Fh reserved
+h	DWORD	bytes already transmitted
+h	DWORD	file size in bytes
+Bh	WORD	pages alread transmitted
+Dh	WORD	number of pages in file
+Fh 80 BYTEs	ASCIZ filename
+Fh	BYTE	1/8 inch page length
+		if page length below set to 01h through 7Fh, this value
+		specifies additional 1/8 inch increments to page length
+h	BYTE	page length
+h = 11 inches
+h to 7Fh = page length is this number of inches plus value of
+/8 inch field above
+h to FEh reserved
+		FFh = ASCII pages ending with formfeed
+h 31 BYTEs	reserved (zeros)
+----------2FCB11-----------------------------
+INT 2F - Communicating Applications Specification - GET QUEUE STATUS
+	AX = CB11h
+	DL = queue to get status of
+h task queue
+h receive queue
+h log queue
+h send events (v1.2+)
+h receive events (v1.2+)
+Return: AX >= 0	 total number of changes made to queue, modulo 32768
+		BX = number of control files currently in queue
+		CX = number of received files (zero for task and log queues)
+	AX < 0	error code (see AX=CB01h)
+SeeAlso: AX=CB12h
+----------2FCB11DL03-------------------------
+INT 2F - Communicating Applications Spec v1.2+ - GET NUMBER OF SEND EVENTS
+	AX = CB11h
+	DL = 03h
+Return: AX = number of successful sends since resident manager started
+	BX = number of unsuccessful sends, including warnings
+SeeAlso: AX=CB11h/DL=04h
+----------2FCB11DL04-------------------------
+INT 2F - Communicating Applications Spec v1.2+ - GET NUMBER OF RECEIVE EVENTS
+	AX = CB11h
+	DL = 04h
+Return:	AX = number of received file events since resident manager started
+	BX = number of received FAX events
+SeeAlso: AX=CB11h/DL=03h
+----------2FCB12-----------------------------
+INT 2F - Communicating Applications Specification - GET HARDWARE STATUS
+	AX = CB12h
+	DS:DX -> 128-byte status buffer
+Return: AX = 0000h successful
+		buffer filled with hardware-dependent status information
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB10h,AX=CB11h
+Format of status buffer for Intel Connection CoProcessor:
+Offset	Size	Description
+h	BYTE	bit flags
+		bit 7: hardware busy sending or receiving
+		bit 6: last page of data
+		bit 5: no data on current page
+		bit 4: retransmit request for current page being transmitted
+		bit 3: NSF mode active
+		bits 2-0: reserved
+h	BYTE	number of kilobytes of free buffer space
+h	BYTE	page buffer status
+		bit 7: Connection CoProcessor has documents to send
+		bits 6-0: number of pages in buffer
+h	BYTE	number of retries left for dialing number
+h	BYTE	page number to retransmit
+h	BYTE	communications status
+		bit 7: originating call
+		bit 6: FAX message to be sent
+		bit 5: on line
+		bit 4: ring detected and receive enabled
+		bit 3: buffer dumped on receive
+		bits 2-0: hardware sequence state
+idle
+dial
+answer
+transmit
+receive
+pre-message
+post-message
+disconnect
+h	BYTE	baud rate
+		bit 7: reserved
+		bits 6-4: baud rate
+= 300 baud	(V.21 SDLC or HDLC mode)
+= 2400 baud (V.27 ter)
+= 4800 baud (V.27 ter)
+= 7200 baud (V.29)
+= 9600 baud (V.29)
+		bits 3-0: reserved, should be 0110
+h  3 BYTEs	reserved
+Ah	BYTE	hardware status
+		bit 7: modem option installed
+		bit 6: Connection CoProcessor has control of DAA (not latched)
+		bit 5: on line (not latched)
+		bit 4: ring detected (not latched)
+		bit 3: data in command buffer (not latched)
+		bit 2: set if using DMA channel 1, clear if using DMA channel 3
+		bit 1: line length compensation bit 1 set (not latched)
+		bit 0: line length compensation bit 0 set (not latched)
+Bh	BYTE	switch states
+		bit 7: reserved
+		bit 6: unused
+		bit 5: spare switch open
+		bit 4: FAX ADR1 switch open
+		bit 3: FAX ADR0 switch open
+		bit 2: alternate interrupt switch open
+		bit 1: COM SEL 1 switch open
+		bit 0: COM SEL 0 switch open
+			Note: valid combinations of bits 0-2 are
+  COM2 IRQ3 IObase 2F8h
+  COM1 IRQ4 IObase 3F8h
+  COM4 IRQ3 IObase 2E8h
+  COM3 IRQ4 IObase 3E8h
+  COM4 IRQ2 IObase 2E8h
+  COM3 IRQ5 IObase 3E8h
+Ch	BYTE	bit flags
+		bit 7: reserved
+		bit 6: auxiliary relay forced ON
+		bit 5: modem select relay forced ON
+		bit 4: offhook relay forced ON
+		bit 3: 9600 bps enabled
+		bit 2: 7200 bps enabled
+		bit 1: 4800 bps enabled
+		bit 0: 2400 bps enabled
+Dh	BYTE	reserved
+Eh	WORD	error count (only valid while busy, reset when idle)
+h	DWORD	size of nonstandard format (NSF) file in bytes
+h	BYTE	'A' if Connection CoProcessor board present
+h  9 BYTEs	reserved
+Eh 21 BYTEs	ASCIZ CCITT identification
+h 77 BYTEs	reserved
+Format of status buffer for Intel SatisFAXtion board:
+Offset	Size	Description
+h	BYTE	connection status flags
+		bit 7: busy in T.30 CCITT fax protocol
+		bit 6: data on current page/file (only used for block xfers)
+		bit 5: retransmission of last page requested
+		bit 4: in file transfer mode
+		bit 3: data in buffer
+		bit 2: data buffer dumped on receive
+		bit 1: 200x100 dpi resolution instead of 200x200 dpi
+		bit 0: data modem in use, FAX image modem not available
+h	BYTE	board state
+		bit 7: reserved
+		bit 6: handset jack active, data and FAX modems not available
+		bits 5-3: current bit rate
+	 300 bps (V.21 HDLC)
+2400 bps (V.27 ter)
+4800 bps (V.27 ter)
+7200 bps (V.29)
+9600 bps (V.29)
+		bits 2-0: T.30 CCITT protocol state
+idle
+dialing
+answering
+transmitting
+receiving
+pre-message
+post-message
+disconnect
+h	BYTE	number of KB free in buffer
+h	BYTE	number of pages or files in buffer
+h	BYTE	number of redials remaining on current number
+h	BYTE	FAX page number to retransmit
+h	BYTE	current page/file in block transfer
+h	BYTE	number of rings received (only if auto-answer enabled)
+h	WORD	error count
+Ah	DWORD	length of file being transferred
+Eh  6 BYTEs	reserved
+h	BYTE	'B' is SatisFAXtion board present
+h 13 BYTEs	ASCIZ transfer agent name
+h  5 BYTEs	ASCIZ transfer agent version number
+h 13 BYTEs	ASCIZ resident loader name
+h  5 BYTEs	ASCIZ resident loader version number
+h 21 BYTEs	ASCIZ remote CSID
+Eh 13 BYTEs	ASCIZ resident manager name
+Bh  5 BYTEs	ASCIZ resident manager version number
+h 32 BYTEs	reserved
+Note:	the Intel Connection CoProcessor and SatisFAXtion may be distinguished
+	  by examining the byte at offset 14h
+----------2FCB13DL00-------------------------
+INT 2F - Communicating Applications Specification - GET DIAGNOSTICS RESULTS
+	AX = CB13h
+	DL = 00h
+Return: AX = 0040h in progress
+	   >= 0	   passed
+	   < 0	   hardware-dependent failure code (see below)
+SeeAlso: AX=CB13h/DL=01h
+Intel Connection CoProcessor failure codes:
+	bit 3: 9600 bps FAX modem module failed
+	bit 2: SDLC chip failed
+	bit 1: RAM failed
+	bit 0: ROM checksum failed
+Intel SatisFAXtion failure codes:
+	bit 1: 2400 bps data modem failed
+	bit 0: 9600 bps FAX modem failed
+----------2FCB13DL01-------------------------
+INT 2F - Communicating Applications Specification - START DIAGNOSTICS
+	AX = CB13h
+	DL = 01h
+Return: AX = 0000h successfully started
+	   < 0	   error code (see AX=CB01h)
+SeeAlso: AX=CB13h/DL=00h
+----------2FCB14-----------------------------
+INT 2F - Communicating Applications Specification - MOVE RECEIVED FILE
+	AX = CB14h
+	BX = event handle
+	CX = receive file number
+h first received file
+	     N	   Nth received file
+	DS:DX -> ASCIZ string specifying new name for file (must not exist)
+Return: AX = 0000h successful
+	   < 0	   error code (see AX=CB01h)
+----------2FCB15-----------------------------
+INT 2F - Communicating Applications Specification - SUBMIT FILE TO SEND
+	AX = CB15h
+	DS:DX -> variable-length data area (see below)
+Return: AX >= 0	event handle
+	   < 0	error code (see AX=CB01h)
+SeeAlso: AX=CB01h
+Format of data area:
+Offset	Size	Description
+h	BYTE	transfer type
+h = 200x200 dpi, fax mode
+h = 100x200 dpi, fax mode
+h = file transfer mode
+h to 7Fh reserved
+h	BYTE	text size
+h = 80 columns
+h = 132 columns
+h to 7Fh reserved
+h	WORD	time to send (DOS packed time format, see INT 21/AX=5700h)
+h	WORD	date to send (DOS packed date format, see INT 21/AX=5700h)
+h 32 BYTEs	ASCIZ destination name
+h 80 BYTEs	ASCIZ name of file to send
+h 47 BYTEs	ASCIZ phone number to dial
+ A5h 64 BYTEs	ASCIZ application-specific tag string
+ E5h	BYTE	reserved (00h)
+ E6h	BYTE	cover page
+h don't send cover page
+h send cover page
+h to 7Fh reserved
+ E7h 23 BYTEs	reserved (zeros)
+ FEh variable	ASCIZ string containing text of cover page (if cover page flag
+		set to 01h)
+----------2FCB16BX1234-----------------------
+INT 2F - Communicating Applications Spec v1.2+ - UNLOAD RESIDENT MANAGER
+	AX = CB16h
+	BX = 1234h
+	CX = 5678h
+	DX = 9ABCh
+Return: AX = 0000h successful
+	   < 0	   error code
+SeeAlso: AX=CB00h
+----------2FCB17-----------------------------
+INT 2F - Communicating Applications Spec v1.2+ - SET COVER PAGE STATUS
+	AX = CB17h
+	BX = event handle
+	CL = cover page status
+h not read
+h read by user
+Return: AX = 0000h successful
+	   < 0	   error code
+----------2FCB80-----------------------------
+INT 2F - Intel SatisFAXtion CASMGR - ???
+	AX = CB80h
+	???
+Return: ???
+----------2FCB81-----------------------------
+INT 2F - Intel SatisFAXtion CASMGR - ???
+	AX = CB81h
+	???
+Return: ???
+----------2FCB82-----------------------------
+INT 2F - Intel SatisFAXtion CASMGR - ???
+	AX = CB82h
+	???
+Return: ???
+----------2FCBDC-----------------------------
+INT 2F - Comwave Microfax Specification - GET STATUS ARRAY
+	AX = CBDCh
+	BL = 56h
+	BH = line number (starts with 1)
+	CX:DX -> 32-byte status buffer or 80 character string
+Return: AX = number of cards installed, or FFFFh on error
+Program: Comwave manufacturers the Microfax line of fax cards which are a high-
+	  performance multi-card FAX solution for OEMs.
+Note:	defaults to AH=CBh but can be changed
+SeeAlso: AX=CBDDh,AX=DA00h
+----------2FCBDD-----------------------------
+INT 2F - Comwave Microfax Specification - COMMAND SUBMISSION
+	AX = CBDDh
+	BL = 56h
+	BH = ?
+	CX:DX -> command to execute
+Return: AX = status
+h success
+	    FFFFh on error
+SeeAlso: AH=2Ah,AX=CBDCh,AX=80FBh
+----------2FCC--SI5453-----------------------
+INT 2F U - Qualitas Qcach v4.00
+	AH = CCh
+	SI = 5453h or 7473h
+	AL = ???
+	DL = 00h or ???
+Return: SI = 7473h
+	???
+----------2FCD00-----------------------------
+INT 2F - Intel Image Processing Interface - INSTALLATION CHECK
+	AX = CD00h
+Return: AL = 00h not installed, OK to install
+h not installed, not OK to install
+	     FFh installed
+SeeAlso: AX=CD02h"Image"
+----------2FCD00-----------------------------
+INT 2F - SWELL.EXE - INSTALLATION CHECK
+	AX = CD00h
+Return: AX = 00FFh installed
+	    BH = major version
+	    BL = minor version
+Note:	SWELL.EXE is a TSR which swaps programs to disk when they EXEC a child
+	  process with INT 21/AH=4Bh
+----------2FCD01-----------------------------
+INT 2F - Intel Image Processing Interface - SET DEVICE NAME
+	AX = CD01h
+	CX:BX -> ASCIZ character device name ("LPTn", "COMn", "PRN")
+Return: AL = 00h successful
+		CX:BX -> internal character device name
+	   = 80h error
+----------2FCD01-----------------------------
+INT 2F - SWELL.EXE - SUSPEND ONCE
+	AX = CD01h
+Return: AX = 0000h
+SeeAlso: AX=CD02h"SWELL"
+----------2FCD02-----------------------------
+INT 2F - Intel Image Processing Interface - GET VERSION NUMBER
+	AX = CD02h
+Return: AL = 00h/01h successful
+		BH = major version number (BCD)
+		BL = minor version number (BCD)
+	   = 80h error
+Note:	if return AL = 01h, the IPI supports network redirection
+SeeAlso: AX=CD00h"Image"
+----------2FCD02-----------------------------
+INT 2F - SWELL.EXE - SUSPEND
+	AX = CD02h
+Return: AX = 0000h
+SeeAlso: AX=CD03h"SWELL"
+----------2FCD03-----------------------------
+INT 2F - Intel Image Processing Interface - SELECT SCAN LINE
+	AX = CD03h
+	BX = scan line
+	CX = requested density in dots per inch (300, 600, or 1200)
+Return: AL = 00h succesful
+		CX = density at which scan line was mapped
+		ES:DI -> start of scan line
+	AL = 80h unsuccessful
+	   = 81h scan line out of range
+	   = 82h unsupported scan line density
+	   = 83h out of memory
+SeeAlso: AX=CD04h"Image"
+----------2FCD03-----------------------------
+INT 2F - SWELL.EXE - ACTIVATE
+	AX = CD03h
+Return: AX = 0000h
+SeeAlso: AX=CD02h"SWELL"
+----------2FCD04-----------------------------
+INT 2F - Intel Image Processing Interface - MOVE BITMAP TO SCANLINE
+	AX = CD04h
+	CX:BX -> structure (see below)
+Return: AL = 00h successful
+	   = 80h unsuccessful
+	   = 81h scan line out of range
+	   = 82h unsupported scan line density
+	   = 83h out of memory
+	   = 84h unrecognized source
+	   = 85h initialization error
+SeeAlso: AX=CD03h"Image"
+Format of structure:
+Offset	Size	Description
+h	WORD	image source (0 = conventional memory, 1 = expanded memory)
+h	DWORD	pointer to image data
+h	WORD	scan line on which to place
+h	WORD	bit offset from start of scan line at which to place
+Ah	WORD	density of bitmap data (300, 600, or 1200 dpi)
+Ch	WORD	width in bits of data
+Eh	WORD	source logical page number
+h	WORD	source handle (only if source in expanded memory)
+h	WORD	source offset (only if source in expanded memory)
+----------2FCD04-----------------------------
+INT 2F - SWELL.EXE - TURN OFF VERBOSE MODE
+	AX = CD04h
+Return: AX = 0000h
+SeeAlso: AX=CD05h"SWELL"
+----------2FCD05-----------------------------
+INT 2F - Intel Image Processing Interface - PRINT PAGE
+	AX = CD05h
+Return: AL = 00h successful
+	   = 80h unsuccessful
+Note:	page image is retained, so multiple calls will print multiple copies of
+	  the page
+SeeAlso: AX=CD06h"Image"
+----------2FCD05-----------------------------
+INT 2F - SWELL.EXE - TURN ON VERBOSE MODE
+	AX = CD05h
+Return: AX = 0000h
+SeeAlso: AX=CD04h"SWELL"
+----------2FCD06-----------------------------
+INT 2F - Intel Image Processing Interface - CLEAR PAGE
+	AX = CD06h
+Return: AL = 00h successful
+	   = 80h unsuccessful
+Note:	palette is reset to default
+SeeAlso: AX=CD09h"Image"
+----------2FCD06-----------------------------
+INT 2F - SWELL.EXE - UNINSTALL
+	AX = CD06h
+Return: AX = 0000h uninstalled
+	   = 8002h programs still swapped, not uninstalled
+----------2FCD07-----------------------------
+INT 2F - Intel Image Processing Interface - reserved
+	AX = CD07h
+----------2FCD07-----------------------------
+INT 2F - SWELL.EXE - GET INFO
+	AX = CD07h
+	ES:BX -> 32-byte buffer for info
+Return: AX = 0000h successful
+	    ES:BX buffer filled
+	   = 8001h buffer wrong size
+Format of info buffer:
+Offset	Size	Description
+h	WORD	20h  (total size of buffer)
+h	BYTE	suspend-once mode active if nonzero
+h	BYTE	00h active, 01h suspended
+h	BYTE	00h quiet, 01h verbose
+h	BYTE	"Borland support" (allowing INT 21/AX=4B01h) on if nonzero
+h 26 BYTEs	unused???
+----------2FCD08-----------------------------
+INT 2F - Intel Image Processing Interface - SCREEN IMAGE
+	AX = CD08h
+	CX:BX -> structure (see below)
+Return: AL = 00h successful
+	   = 80h unsuccessful
+	   = 81h scan line out of range
+	   = 82h unsupported scan line density
+	   = 83h out of memory
+	   = 84h unrecognized source
+	   = 85h initialization error
+SeeAlso: AX=CD05h"Image",AX=CD09h"Image"
+Format of structure:
+Offset	Size	Description
+h	WORD	image source (0 = conventional memory, 1 = expanded memory)
+h	DWORD	pointer to image data
+h	WORD	horizontal position on paper of left edge (in 1200 dpi units)
+h	WORD	vertical position on paper of top edge (in 1200 dpi units)
+Ah	WORD	left cropping (currently must be zero)
+Ch	WORD	top cropping (currently must be zero)
+Eh	WORD	width (currently must be 8000h)
+h	WORD	height (currently must be 8000h)
+h	WORD	horizontal size of image in 1200 dpi units
+h	WORD	vertical size of image in 1200 dpi units
+h	WORD	aspect ratio (currently reserved)
+h	WORD	initialization flag (if 01h, initialization is performed)
+Ah	WORD	pixels per line of source data
+Ch	WORD	number of scan lines in source data
+Eh	WORD	number of scan lines in packet
+h	WORD	bits per pixel (1,2,4,6, or 8)
+h	WORD	pixels per byte (1,2,4, or 8)
+h	WORD	compression type (currently only 00h [uncompressed] supported)
+h	WORD	source page number (if in expanded memory)
+h	WORD	source handle (if in expanded memory)
+Ah	WORD	source offset (if in expanded memory)
+----------2FCD08-----------------------------
+INT 2F - SWELL.EXE - UNUSED
+	AX = CD08h
+Return: AX = FFFFh (error)
+----------2FCD09-----------------------------
+INT 2F - Intel Image Processing Interface - LOAD SCREEN
+	AX = CD09h
+	CX:BX -> structure (see below)
+Return: AL = 00h successful
+	   = 80h unsuccessful
+SeeAlso: AX=CD06h"Image Processing",AX=CD0Ah"Image Processing"
+Format of structure:
+Offset	Size	Description
+h	BYTE	style
+h ('D') diamond style
+Ch ('L') line style
+h	BYTE	reserved (00h)
+h	WORD	frequency in lines per inch [sic]
+		currently, coerced to nearest of 50, 60, 68, 70, 75, 85, or 100
+h	WORD	screen angle in degrees (-360 to 360)
+		currently coerced to nearest of -45, 0, 45, or 90
+----------2FCD09-----------------------------
+INT 2F - SWELL.EXE - TURN OFF "BORLAND SUPPORT"
+	AX = CD09h
+Return: AX = 0000h
+SeeAlso: AX=CD0Ah"SWELL"
+----------2FCD0A-----------------------------
+INT 2F - Intel Image Processing Interface - LOAD PALETTE
+	AX = CD0Ah
+	CX:BX -> palette structure (see below)
+Return: AL = 00h successful
+	   = 80h unsuccessful
+SeeAlso: AX=CD09h"Image Processing"
+Format of palette structure:
+Offset	Size	Description
+h	BYTE	bits per pixel for which palette is to be used (1,2,4,6, or 8)
+h	2**N	palette translation values, one per possible pixel value
+----------2FCD0A-----------------------------
+INT 2F - SWELL.EXE - TURN ON "BORLAND SUPPORT"
+	AX = CD0Ah
+Return: AX = 0000h
+SeeAlso: AX=CD09h"SWELL"
+----------2FD000-----------------------------
+INT 2F - MDEBUG display driver - GET DRIVER STATUS
+	AX = D000h
+Return: CF set on error
+	    all other registers must be unchanged)
+	CF clear if successful
+	    AL = FFh
+	    AH = driver semaphor
+h driver is not active
+h driver is active
+	    BX = CS of the driver
+	    CX = driver version (CH = major, CL = minor, must be >= 013Ch)
+	    DL = buffer semaphor
+h driver is not pending
+h driver is pending between functions 02h and 03h
+	    DH = show semaphor
+h driver is not pending
+h driver is pending between functions 04h and 05h
+Notes:	MDEBUG is a shareware memory-resident debugging tool by Bernd Schemmer,
+	  including a memory monitor, an interpreter and a disassembler
+	MDEBUG can use any two consecutive multiplex numbers between C0h and
+	  FFh; the default is D0h for the display driver and D1h for the
+	  command driver (see INT 60/AH=00h"MDEBUG" for the actual multiplex
+	  numbers used)
+	this function MUST be reentrant, as MDEBUG calls it after every popup
+	  before any other actions.  The handler should not change any
+	  registers if the display is in an unsupported mode or in a mode
+	  MDEBUG supports itself, e.g. a normal text mode with at least 80x25
+	  characters (i.e. 80x43 or 132x44 (v1.60+)). In this case MDEBUG will
+	  not call any of the other functions for this popup session.
+	MDEBUG will not call the other functions if the returned version is
+	  less than the actual version of MDEBUG.
+	if the driver is reentrant, DL and DH should be 00h
+SeeAlso: AX=D001h,AX=D002h,AX=D003h,AX=D004h,AX=D005h
+----------2FD000-----------------------------
+INT 2F - ZWmous - INSTALLATION CHECK
+	AX = D000h
+Return: AX = 5A57h ("ZW") if installed
+	    BX = segment of resident code
+Note:	ZWmous is a shareware TSR by Zen Wu which permits the use of a mouse
+	  with many non-mouse applications by entering the letter under the
+	  mouse cursor on button presses
+SeeAlso: INT 33/AX=0003h
+----------2FD000-----------------------------
+INT 2F - Lotus CD/Networker - INSTALLATION CHECK
+	AX = D000h
+Return: AL = FF if CD/Networker TSR is loaded
+	BX = 4D44h ("MD") signature
+	CX = Windows mode word (from INT 2F/AX=1600h) at time of TSR load
+	DX = bitmap identifying all loaded CD/Networker TSRs.
+Notes:	INT 2F/AH=D0h is used by CD/Networker to communicate between a
+	  resident redirector TSR and a transient program that controls the
+	  TSR's CD-ROM drive emulation (volume attachments, caching, etc).
+	At present there is only one CD/Networker TSR; the bitmap always = 4.
+SeeAlso: AX=D002h"Lotus",INT 2F/AX=1500h"CD-ROM"
+----------2FD001-----------------------------
+INT 2F - MDEBUG display driver - INITIALIZE DRIVER
+	AX = D001h
+Return: CF set on error
+	AL = driver semaphor
+	AH = buffer semaphor
+Notes:	MDEBUG calls this function after every succesful call of the function
+h. The function should reset all internal data and the status of
+	  the driver. If this function returns an error, MDEBUG will not call
+	  the other functions in this popup session.
+	MDEBUG can use any two consecutive multiplex numbers between C0h and
+	  FFh; the default is D0h for the display driver and D1h for the
+	  command driver
+SeeAlso: AX=D000h
+----------2FD002-----------------------------
+INT 2F - MDEBUG display driver - SAVE GRAPHIC DATA
+	AX = D002h
+Return: CF set on error
+	CF clear if successful
+	    display memory saved and display switched to one of the text modes
+h, 03h or 07h.
+Note:	MDEBUG calls this function only once every popup session before
+	  displaying its windows.
+SeeAlso: AX=D000h,AX=D003h
+----------2FD002BX4D44-----------------------
+INT 2F - Multiplex - Lotus CD/Networker GET DATA AREA
+	AX = D002h
+	BX = 4D44h
+	DX = bitmap identifying one loaded CD/Networker TSR
+Return: ES:DI -> data area owned by TSR
+Note:	the format of the data area changes with each minor revision, so it
+	  cannot be counted on
+SeeAlso: AX=D000h"Lotus"
+----------2FD003-----------------------------
+INT 2F - MDEBUG display driver - RESTORE GRAPHIC DATA
+	AX = D003h
+Return: CF set on error
+	CF clear if successful
+	    display restored to the mode it was in before calling AX=D002h and
+	      the display memory is restored
+Note:	MDEBUG calls this function only once every popup session just before
+	 it exits to normal DOS.
+SeeAlso: AX=D000h,AX=D002h
+----------2FD004-----------------------------
+INT 2F - MDEBUG display driver - SHOW SAVED DATA
+	AX = D004h
+Return: CF set on error
+	CF clear if successful
+	    display switched to mode it was in before calling AX=D002h and the
+	      display memory is restored
+Note:	This function needn't save the display memory before changing it.
+SeeAlso: AX=D000h,AX=D005h
+----------2FD005-----------------------------
+INT 2F - MDEBUG display driver - SWITCH BACK TO TEXT SCREEN
+	AX = D005h
+Return: CF set on error
+	CF clear if successful
+	    display restored to mode it was in before calling AX=D004h
+Note:	This function needn't save or change the display memory
+SeeAlso: AX=D000h,AX=D004h
+----------2FD0-------------------------------
+INT 2F - MDEBUG display driver - RESERVED FUNCTION NUMBERS
+	AH = D0h
+	AL = 06h-7Fh
+Note:	these functions are reserved for future use
+----------2FD0-------------------------------
+INT 2F - MDEBUG display driver - USER DEFINED FUNCTION NUMBERS
+	AH = D0h
+	AL = 80h-FFh
+Note:	these functions numbers are reserved for user defined features (e.g.
+	  communication between the transient und resident parts of the driver)
+----------2FD100-----------------------------
+INT 2F - MDEBUG command driver - GET STATUS
+	AX = D100h
+	BX = version of MDEBUG (BH = major, BL = minor)
+	CX = command driver counter
+---v1.60+---
+	DS:SI -> MDEBUG identification table (see below)
+	ES = segment of display memory used by MDEBUG
+	DI = size of video mode used by MDEBUG
+	    (high byte = lines, low byte = columns)
+Return: DL = FFh
+	BX = version number of the driver if it is less than the version in BX,
+	     else unchanged
+	CX incremented
+Notes:	MDEBUG is a shareware memory-resident debugging tool by Bernd Schemmer,
+	  including a memory monitor, an interpreter, and a disassembler
+	called by MDEBUG at start of popup session; if the version number
+	  returned in BX is less than 1.52 (1.60 for MDEBUG v1.70), MDEBUG will
+	  not call any of the other functions during this popup session
+	MDEBUG can use any two consecutive multiplex numbers between C0h and
+	  FFh; the default is D0h for the display driver and D1h for the
+	  command driver (see INT 60/AH=00h"MDEBUG" for the multiplex numbers
+	  actually used)
+	this function must end with a far call to the old INT 2F handler after
+	  changing the registers
+	this function MUST be reentrant
+	command drivers must also declare the following data at the given
+	  offsets in the code segment
+h  3 BYTEs	JMP-command in .COM-files
+h	BYTE	NOP-command (90h)
+h 26 BYTEs	signature "Kommandotreiber fr MDEBUG"
+Eh 12 BYTEs	name of driver, e.g. "MDHISDRV.COM"
+				each driver must have a unique name
+	MDEBUG will pass every key and command to the command driver(s) before
+	  checking for a valid internal command
+SeeAlso: AX=D000h,AX=D101h
+Format of MDEBUG identification table:
+Offset	Size	Description
+ -2	WORD	entry offset
+h	WORD	CS of MDEBUG
+h	DWORD	old INT 08h vector
+h	DWORD	old INT 09h vector
+Ah	DWORD	address INT 16h routine used by MDEBUG
+Eh	BYTE	length of version string
+Fh  N BYTEs	version string
+----------2FD101-----------------------------
+INT 2F - MDEBUG command driver - INITIALIZE DRIVER
+	AX = D101h
+	CX = command driver counter
+Return: DL = FFh if successful
+		CX incremented
+	     else error: all registers unchanged
+Note:	this function must end with a  far call to the old INT 2F handler after
+	  changing the registers
+	this function must be reentrant
+----------2FD102-----------------------------
+INT 2F - MDEBUG command driver - EXECUTE INTERPRETER COMMAND
+	AX = D102h
+	BL = first character of the interpreter command
+	BH = last character of the interpreter command (or blank)
+	DS:SI -> parameter for the interpreter command as ASCIZ string
+	DS:DI -> MDEBUG data structure (see below)
+Return: AL = FFh
+	CF set on error
+	    AH = error number
+h syntax error
+h first shell of the command.com is activ
+h esc pressed
+h break pressed
+h DOS is busy
+h command ended
+h division by zero
+h invalid display driver
+h invalid command driver
+Ah error 8 and 9
+Bh unknown error
+Ch new error
+		    DS:SI -> ASCIZ error message (max 30 characters)
+	       else unknown error
+	CF clear if successful
+	    AH = return code
+h continue processing the command line
+h leave MDEBUG popup session
+h leave MDEBUG popup session and automatically popup again
+		    if the InDOS flag is zero
+h not used (same as 00h)
+h not used (same as 00h)
+h put new command line into the input buffer,
+		    DS:SI -> new command line (ASCIZ string, max 66 chars)
+h process new command line
+		    DS:SI -> new command line (ASCIZ string, max 66 chars)
+	       else unknown status, but continue processing commmand line
+Note:	this function must end with a far call to the old INT 2F handler (with
+	  registers unchanged) if the driver does not support the interpreter
+	  command in BX.  Otherwise, the driver must not chain to the old
+	  INT 2F.
+Format of MDEBUG data structure:
+Offset	Size	Description
+h	WORD	register SE
+h	WORD	register OF
+h	WORD	register FS
+h	WORD	register FO
+h	WORD	register AX
+Ah	WORD	register BX
+Ch	WORD	register CX
+Eh	WORD	register DX
+h	WORD	register SI
+h	WORD	register DI
+h	WORD	register DS
+h	WORD	register ES
+h	WORD	register BP
+Ah	WORD	register SS
+Ch	WORD	register SP
+Eh	WORD	register FL (flags)
+h	WORD	register R0
+h	WORD	register R1
+h	WORD	register R2
+h	WORD	register R3
+h	WORD	register R4
+Ah	WORD	register R5
+Ch	WORD	register R6
+Eh	WORD	register R7
+h	WORD	register R8
+h	WORD	register CS, return-address
+h	WORD	register IP, return-address
+h	DWORD	saved pointer to data for key <F6> (v1.60)
+ 		saved monitor address (v1.70)
+Ah 12 WORDs	saved register values on last popup entry (for <F8> key)
+		(original register values at popup entry of MDEBUG)
+		AX, BX, CX, DX, SI, DI, DS, ES, BP, SS, SP, flags
+h 12 WORDs	saved register values on last popup exit (for <SHIFT-F8> key)
+		AX, BX, CX, DX, SI, DI, DS, ES, BP, SS, SP, flags
+Ah	DWORD	address of the DOS-invars-table
+Eh	DWORD	address of the InDOS flag
+h	WORD	offset of the register which is used for the segment of the
+		first monitor window
+h	WORD	offset of the register which is used for the offset of the
+		first monitor window
+h	WORD	name of the register which is used for the segment of the
+		first monitor segment
+h	WORD	name of the register which is used for the offset of the first
+		monitor window
+Ah	WORD	pseudo register 1
+Ch	WORD	pseudo register 2
+----------2FD103-----------------------------
+INT 2F - MDEBUG command driver - EXECUTE KEY IN THE MONITOR
+	AX = D103h
+	BX = key code (like result of an interrupt 16h call)
+	CX = 0 -> the cursor is in the ASCII column of the monitor
+	CX = 1 -> the cursor is in one of the hex fields of the monitor
+	DS:SI -> MDEBUG data structure (see AX=D102h)
+	ES:DI -> actual byte in the monitor
+Return: AL = FFh
+	AH = return code
+h key processed, read next key
+h leave MDEBUG popup session
+h leave MDEBUG popup session and automatically popup again if DOS
+		is not busy
+h signal an error (beep)
+h driver has redefined the key, proceed with the new key
+		BX = new key code
+		MDEBUG will not pass the new key to the command driver(s)
+	   else treat like code 00h
+Note:	this function must end with a far call to the old INT 2F handler (with
+	  registers unchanged) if the driver does not support the key in BX.
+	  Otherwise, the driver must not chain to the old INT 2F.
+SeeAlso: AX=D104h
+----------2FD104-----------------------------
+INT 2F - MDEBUG command driver - EXECUTE KEY IN THE INTERPRETER
+	AX = D104h
+	DS:SI -> MDEBUG data structure (see AX=D102h)
+Return: AL = FFh
+	AH = return code
+h key processed, read next key
+h leave MDEBUG popup session
+h leave MDEBUG popup session and automactically popup again if
+		DOS is not busy
+h signal an error (beep)
+h driver has redefined the key, proceed with the new key
+		BX = new key code
+		MDEBUG won't pass the new key to the command driver(s)
+h put new command line into the input buffer
+		DS:SI -> new command line (ASCIZ string, max 66 chars)
+h process new command line
+		DS:SI -> new command line (ASCIZ string, max 66 chars)
+	   else treat like code 00h
+Note:	this function must end with a far call to the old INT 2F handler if the
+	  driver does not support the key in BX.  Otherwise, the driver must
+	  not chain to the old INT 2F.
+SeeAlso: AX=D103h
+----------2FD1-------------------------------
+INT 2F - MDEBUG command driver - RESERVED FUNCTIONS
+	AH = D1h
+	AL = 05h-0Ah
+Note:	these functions are reserved for future use
+----------2FD110-----------------------------
+INT 2F - MDEBUG command driver - GET ADDRESS OF THE OLD INT 2F
+	AX = D110h
+Return: DL = FFh
+	ES:BX -> next program in the chain for INT 2F
+	CX = code segment of this driver
+	DI = offset of driver identification table (see below) (v1.60+)
+Notes:	only called by the transient part of the driver
+	must be reentrant and the driver must not chain this function to the
+	  old INT 2F
+Format of the driver identification table:
+Offset	Size	Description
+h  26 BYTEs	 signature "Kommandotreiber fr MDEBUG"
+                                             ^- Note: ASCII 129,German U-umlaut
+h  12 BYTEs	 name of driver, e.g. "MDHISDRV.COM"
+		 each driver must have a unique name
+----------2FD111-----------------------------
+INT 2F - MDEBUG command driver - START DRIVER
+	AX = D111h
+Return: DL = FFh
+Notes:	only called by the transient part of the driver to inform the resident
+	  part that it is installed
+	the function must be reentrant and the driver mustn't chain this
+	  function to the old INT 2F
+SeeAlso: AX=D101h,AX=D112h
+----------2FD112-----------------------------
+INT 2F - MDEBUG command driver - END DRIVER
+	AX = D112h
+Return: DL = FFh
+Notes:	only called by the transient part of the driver to inform the resident
+	  part that it will be released after this function
+	the function must be reentrant and the driver mustn't chain this
+	  function to the old INT 2F
+SeeAlso: AX=D101h,AX=D111h
+----------2FD1-------------------------------
+INT 2F - MDEBUG command driver - RESERVED FUNCTIONS
+	AH = D1h
+	AL = 13h-7Fh
+Note:	these functions are reserved for future use
+----------2FD1-------------------------------
+INT 2F - MDEBUG command driver - USER DEFINED FUNCTIONS
+	AH = D1h
+	AL = 80h-FFh
+Note:	these functions are reserved for user defined features (e.g.
+	  communication between the transient und resident parts of the	driver)
+----------2FD200BX5144-----------------------
+INT 2F U - Quarterdeck - QEMM/QRAM/VIDRAM/MANIFEST v5.0+ - INSTALLATION CHECK
+	AX = D200h
+	BX = 5144h ("QD")
+	CX = 4D45h ("ME")
+	DX = 4D30h ("M0")
+Return: AL = FFh installed
+	if BX,CX,DX registers were as specified on entry:
+	    BX = 4D45h ("ME")
+	    CX = 4D44h ("MD")
+	    DX = 5652h ("VR")
+Notes:	QEMM/QRAM/VIDRAM/MANIFEST/etc will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+	for AL <> 0, if the BX/CX/DX values don't match a the identifier of a
+	  Quarterdeck product, it just chains to the previous INT 2F handler
+----------2FD201BX4849-----------------------
+INT 2F U - Quarterdeck - GET QD HIMEM PRESENCE
+	AX = D201h
+	BX = 4849h ("HI")
+	CX = 4D45h ("ME")
+	DX = 4D51h ("MQ")
+Return: BX = 4F4Bh ("OK")
+	ES:DI -> HIMEM entry point
+Notes:	QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+SeeAlso: AX=D201h/BX=5145h
+----------2FD201BX4849-----------------------
+INT 2F U - Quarterdeck - QEMM/QRAM v5.0+ - GET HIRAM MEMORY CHAIN
+	AX = D201h
+	BX = 4849h ("HI")
+	CX = 5241h ("RA")
+	DX = 4D30h ("M0")
+Return: BX = 4F4Bh ("OK")
+	CX = segment of start of HIRAM chain
+	DX = QEMM/QRAM code segment
+Notes:	QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+	QEMM and QRAM both responded the same
+	the HIRAM memory chain has the same format as the regular DOS 4.0
+	  memory chain (see INT 21/AH=52h), except that XMS Upper Memory Blocks
+	  have the block header program name field set to "UMB"; blocks whose
+	  "owner" field is set to the QEMM/QRAM code segment returned in DX
+	  are locked out regions such as video memory and ROMs.
+----------2FD201BX4D41-----------------------
+INT 2F U - Quarterdeck - MANIFEST v1.0+ - INSTALLATION CHECK
+	AX = D201h
+	BX = 4D41h ("MA")
+	CX = 4E49h ("NI")
+	DX = 4645h ("FE")
+Return: BX = 5354h ("ST")
+Note:	QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+----------2FD201BX4D45-----------------------
+INT 2F U - Quarterdeck - DVDOS4GX.DVR - ???
+	AX = D201h
+	BX = 4D45h ("ME")
+	CX = 5155h ("QU")
+	DX = 5044h ("PD")
+Return: ???
+Notes:	AH=D2h is the default; use the Quarterdeck installation check described
+	  under AX=D200h
+	called by QEMM 6.03
+----------2FD201BX5145-----------------------
+INT 2F U - Quarterdeck - QEMM v5.0+ - INSTALLATION CHECK
+	AX = D201h
+	BX = 5145h ("QE")
+	CX = 4D4Dh ("MM")
+	DX = 3432h ("42")
+Return: BX = 4F4Bh ("OK")
+	ES:DI -> QEMM API entry point (see INT 67/AH=3Fh)
+Notes:	QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+	this call is not available under QEMM v6.00 unless Windows3 support
+	  has been disabled with the NW3 switch to QEMM386.SYS
+SeeAlso: AX=D201h/BX=4849h,INT 67/AH=3Fh
+----------2FD201BX5649-----------------------
+INT 2F U - Quarterdeck - VIDRAM v5.0+ - INSTALLATION CHECK
+	AX = D201h
+	BX = 5649h ("VI")
+	CX = 4452h ("DR")
+	DX = 414dh ("AM")
+Return: BX = 4F4Bh ("OK")
+	ES:DI -> VIDRAM entry point
+Note:	QEMM/QRAM/VIDRAM/MANIFEST will search for a free AH value from D2h
+	  through FFh, then C0h through D1h
+Call VIDRAM entry point with:
+	AH = 00h get status
+		Return: AL = VIDRAM state (see below)
+			BL = bit 0: ???
+			     bits 1-7 not used
+			BH = flags???
+			    bit 4: high RAM exists in video area???
+			CL = current monitor (01h = mono, 80h = color)
+			SI = current top of memory (paragraph)???
+			DI = segment of ???
+	AH = 01h setup
+		AL = VIDRAM state (00h off, 01h no EGA graphics, 02h no graph)
+		BL = bit 0: ???
+		     bits 1-7 not used
+		BH = flags???
+		CL = monitor (01h = monochrome, 80h = color)
+		SI = new top of memory (paragraph)???
+	AH = 02h get ???
+		Return: ES:DI -> ??? data
+Return: CF set on error
+	CF clear if successful
+----------2FD300BX4562-----------------------
+INT 2F U - TeleReplica - INSTALLATION CHECK
+	AX = D300h
+	BX = 4562h
+	CX = 2745h
+	DX = serial port I/O base address??? (03F8h for v3.9)
+Return: SI = segment of resident code
+	AX = 251Dh
+	BX = DF21h
+	CX = F321h
+	DX = ???
+----------2FD3CB-----------------------------
+INT 2F U - LapLink Quick Connect v6 - API
+	AX = D3CBh
+	CX = function
+h get ???
+		Return: BX:AX -> ???
+			CL = ???
+			CH = ???
+			DX = ???
+			DI = COM1 I/O port???
+			SI = COM2 I/O port???
+h initialization???
+h ???
+h initialization???
+h reset/clear ???
+		Return: AX = 0000h
+			ES:DI -> next byte after ??? cleared by this call
+h initialization???
+h uninstall
+		Return: BX = status
+h successful
+			    FFFFh incomplete, stub remains in memory
+Return: CX = 534Bh (except function 0002h)
+----------2FD44D-----------------------------
+INT 2F - 4DOS.COM v2.1+ - API
+	AX = D44Dh
+	BH = function
+h installation check
+		Return: AX = 44DDh
+			BL = minor version number
+			BH = major version number
+			CX = PSP segment address for current invocation
+			DL = 4DOS shell number (0 for the first (root) shell,
+			     updated each time a new copy is loaded)
+h (internal, v2.1-3.03) terminate current copy of 4DOS
+		Return: nothing
+		(internal, v4.0) ???
+		Return: ES:BX -> data area (see below)
+h ???
+		DX = ???
+	---v2.1-3.03 only---
+h EXEC program
+		CX:DX -> EXEC record
+	    FEh deallocate shell number (passed through to root shell)
+		???
+	    FFh allocate shell number (passed through to root shell)
+Note:	bug in v3.00 will crash system if unrecognized value in BH
+SeeAlso: AX=D44Eh,AX=E44Dh,INT 21/AX=4403h
+Format of EXEC record:
+Offset	Size	Description
+h	WORD	offset of ASCIZ program name in same segment as EXEC record
+h	WORD	offset of DOS commandline in same segment as EXEC record
+h	WORD	segment of environment for child process (see INT 21/AH=26h)
+Format of 4DOS v4.0 data area:
+Offset	Size	Description
+h  2 BYTEs	???
+h	WORD	XMS handle for swapping
+	???
+----------2FD44E-----------------------------
+INT 2F - 4DOS v3.0+ - AWAITING USER INPUT
+	AX = D44Eh
+---4DOS v3.01+---
+	BX = 0000h 4DOS is ready to display prompt
+	   = 0001h 4DOS has displayed the prompt, about to accept user input
+Return: handler must preserve SI, DI, BP, SP, DS, ES, and SS
+Note:	v3.00 only makes the call corresponding to BX=0001h, does not set BX
+SeeAlso: AX=D44Dh
+----------2FD44FBX0000-----------------------
+INT 2F - 4DOS v4.0+ - KSTACK.COM - INSTALLATION CHECK
+	AX = D44Fh
+	BX = 0000h
+Return: AX = 44DDh if installed
+SeeAlso: AX=D44Fh/BX=0001h
+----------2FD44FBX0001-----------------------
+INT 2F - 4DOS v4.0+ - KSTACK.COM - PLACE KEYSTROKES INTO KEYSTACK
+	AX = D44Fh
+	BX = 0001h
+	CX = number of keystrokes (01h-FFh)
+	DS:DX -> keystroke list (one word per keystroke)
+Return: AX = status
+h successful
+	    nonzero failed
+	BX,CX,DX destroyed
+Notes:	the keystrokes are the exact values to return from subsequent calls to
+	  INT 16 with AH=00h,01h,10h, or 11h, with the following exceptions:
+h causes subfunctions 01h and 11h to indicate an empty
+			keyboard buffer
+		FFFFh is followed by a word indicating the number of clock
+			ticks to delay before the next faked keystroke
+	v4.00 KSTACK overwrites any unread keystrokes from the previous
+	  invocation, and does not range-check CX; it will overwrite memory
+	  following the resident portion if CX is greater than 100h.
+SeeAlso: AX=D44Fh/BX=0000h,INT 16/AH=00h,INT 21/AX=4403h
+----------2FD600-----------------------------
+INT 2F - HEART.COM - INSTALLATION CHECK
+	AX = D600h
+Return: AX = 0303h (two hearts) if installed
+	    ES:DI -> buffer (see below)
+Note:	HEART.COM is a CPU lock-up/critical indicator utility by Mitch Davis.
+	Once the host program has identified the address of the data area, it
+	  can change this to indicate safe/critical, alternate colours, etc.
+	The entries for the color table are in char/attrib form.  Every two
+	  entries form a pair which is alternated between 68 times a minute.
+	  The first half of the table is for color videos, the second mono.
+	  Within each half, the first half is for the safe chars, and the
+	  second for the critical chars.
+Format of buffer:
+Offset	Size	Description
+h  8 WORD	Table of colors/attributes (see notes).
+h	BYTE	flags
+		bit 0: program is in critical section, so flash double
+			exclamation mark
+		bit 1: program is in safe code, so flash the heart character
+h	WORD	position of heartbeat on screen, normally 009Eh (last column
+		of second line)
+----------2FD600-----------------------------
+INT 2F U - VEDIT VSWAP - INSTALLATION CHECK
+	AX = D600h
+Return: AL = D6h if installed
+Note:	VSWAP is the resident portion of VEDIT's "swapper" capability.
+      	VEDIT is a programmer's text editor by Greenview Data.
+SeeAlso: AX=D601h,AX=D602h
+----------2FD601-----------------------------
+INT 2F U - VEDIT VSWAP - ???
+	AX = D601h
+	BL = subfunction number???
+Return: BL = return code ???
+	ES = resident portion's data??? segment
+	DX = resident portion's code segment
+SeeAlso: AX=D600h"VSWAP"
+----------2FD602-----------------------------
+INT 2F U - VEDIT VSWAP - EXEC PROGRAM WITH SWAP
+	AX = D602h
+	other registers set as for INT 21/AX=4B00h
+Return: CF set on error
+	    AL = error code
+h = failure due to ???
+	CF clear on success
+SeeAlso: AX=D600h"VSWAP",INT 21/AX=4Bh"EXEC"
+----------2FD701-----------------------------
+INT 2F - BANYAN VINES v4+ - GET BANV INTERRUPT NUMBER
+	AX = D701h
+Return: AX = 0000h installed
+	    BX = interrupt number (60h to 66h)
+	   nonzero not present
+Note:	if AX is nonzero, VINES 3.x or earlier may be installed, thus it is
+	  necessary to examine the four bytes preceding the handlers for
+	  INT 60 through INT 66 for the string "BANV"
+SeeAlso: AX=D702h,AX=D703h,AX=D704h
+----------2FD702-----------------------------
+INT 2F U - BANYAN VINES v4+ - PCPRINT interface
+        AX = D702h
+        BX = function
+        ???
+Return: ???
+SeeAlso: AX=D701h,AX=D703h,INT 61/AX=0005h"Banyan"
+----------2FD703-----------------------------
+INT 2F U - BANYAN VINES v4+ - MAIL interface
+        AX = D703h
+        BX = function
+        ???
+Return: ???
+SeeAlso: AX=D702h,AX=D704h
+----------2FD704-----------------------------
+INT 2F U - BANYAN VINES v4+ - Streettalk Directory Assistance interface
+        AX = D704h
+        BX = function
+        ???
+Return: ???
+SeeAlso: AX=D703h,INT 61/AX=0007h"Banyan"
+----------2FD800-----------------------------
+INT 2F - Novell NetWare Lite - CLIENT.EXE - INSTALLATION CHECK
+	AX = D800h
+Return:	AL = FFh if installed
+	    DX = version number??? (0100h in 1.00)
+	    BX = data segment of resident copy???
+	    ES:DI = FAR entry point for API routines
+		    Load BX = function number and call for various
+		    functions.	Functions 00h - 10h supported in 1.00.
+SeeAlso: AX=7A00h,AX=D880h
+----------2FD880-----------------------------
+INT 2F - Novell NetWare Lite - SERVER.EXE - INSTALLATION CHECK
+	AX = D880h
+Return:	AL = FFh if installed
+	    DX = version number??? (0100h in 1.00)
+	    BX = Data segment of resident copy???
+	    CL = 01h if SERVER is active
+	       = 00h if SERVER is disabled
+SeeAlso: AX=7A00h,AX=D800h
+----------2FDA00-----------------------------
+INT 2F - ZyXEL ZFAX - INSTALLATION CHECK
+	AX = DA00h
+Return: AH = enabled state (00h = enabled, 01h = disabled)
+	AL = 5Ah installed
+Note:	ZFAX is the bundled FAX software which comes with the ZyXEL model
+	  fax modems.
+SeeAlso: AX=CBDCh,AX=DA01h,AX=DA02h,AX=DA03h
+----------2FDA01-----------------------------
+INT 2F - ZyXEL ZFAX - UNINSTALL
+	AX = DA01h
+Return: AL = 00h Success
+h Failure
+SeeAlso: AX=DA00h
+----------2FDA02-----------------------------
+INT 2F - ZyXEL ZFAX - DISABLE
+	AX = DA02h
+Return: AL = 00h
+SeeAlso: AX=DA03h
+----------2FDA03-----------------------------
+INT 2F - ZyXEL ZFAX - ENABLE
+	AX = DA03h
+Return: AL = 00h
+SeeAlso: AX=DA02h
+----------2FDA55-----------------------------
+INT 2F U - TRAP.COM - INSTALLATION CHECK
+	AX = DA55h
+	DL = interrupt number
+	DH = ???
+Return: if installed
+	    AH = interrupt number
+	    AL = ???
+	    ES:BX -> ???
+Notes:	TRAP is an interrupt call tracer by Patrick Phillipot/Udo Chrosziel
+	a separate copy of TRAP is loaded for each interrupt to be traced; thus
+	  the interrupt number is part of the installation check
+----------2FDC00-----------------------------
+INT 2F - GOLD.COM - INSTALLATION CHECK
+	AX = DC00h
+Return: AL = 00h not installed
+	   = FFh installed
+Note:	GOLD is a TSR by Bob Eager which makes the NumLock key return the code
+	  for F1; the purpose is to improve Kermit's VTxxx emulation
+----------2FDC01-----------------------------
+INT 2F - GOLD.COM - GET STATE
+	AX = DC01h
+Return:	AL = status
+h off
+h on
+SeeAlso: AX=DC00h,AX=DC02h
+----------2FDC02-----------------------------
+INT 2F - GOLD.COM - SET STATE
+	AX = DC02h
+	DL = new state
+h off
+h on
+Return: AL = 00h (OK)
+SeeAlso: AX=DC01h
+----------2FDD-------------------------------
+INT 2F - SoftCom programs - API
+	AH = DDh
+	AL = FEh get info
+	    Return: ES:BX -> TSR info list (see below)
+	AL = program identifier
+	    BH = function
+		FDh get version
+		    Return: BX = version
+		FFh installation check
+		    Return: AL = FFh if installed
+				BX = version
+				ES = segment of resident code
+		others vary by program
+Return: AL = status
+	    bit 7 set on error
+	    AL = 81h unknown function
+Format of TSR info list:
+Offset	Size	Description
+h  9 BYTEs	blank-padded ASCIZ program name
+h	BYTE	program ID
+Ah	WORD	program's PSP segment
+Ch	WORD	program version (major in high byte)
+Eh	DWORD	pointer to next item in info list or 0000h:0000h
+h	BYTE	number of interrupts hooked
+h  5 BYTEs	interrupt numbers hooked by program
+h  8 BYTEs	reserved
+----------2FDE00BX4445-----------------------
+INT 2F - DESQview v2.26+ External Device Interface - INSTALLATION CHECK
+	AX = DE00h
+	BX = 4445h ("DE")
+	CX = 5844h ("XD")
+	DX = 4931h ("I1")
+Return: AL = FFh if installed (even if other registers do not match)
+	if BX,CX, and DX were as specified on entry,
+	    BX = 4845h ("HE")
+	    CX = 5245h ("RE")
+	    DX = 4456h ("DV")
+Notes:	AH=DEh is the default XDI multiplex number, but may range from C0h-FFh
+	programs should check for XDI starting at DEh to FFh, then C0h to DDh
+	the XDI handler should not issue any DOS or BIOS calls, nor should it
+	  issue DESQview API calls other than those allowed from hardware ints
+----------2FDE01-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - DRIVER CUSTOM SUBFUNCTION
+	AX = DE01h
+	BX = driver ID
+	other registers as needed by driver
+Notes:	XDI drivers should pass this call through to previous handler if ID
+	  does not match
+	DESQview never calls this function
+----------2FDE01BX5242-----------------------
+INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, Ralf Brown's XDI drivers
+	AX = DE01h
+	BX = 5242h ("RB")
+	CX:DX = program identifier
+F7000h ("eop",0) for DVeop
+Return: AX = 5242h ("RB") if installed
+	    ES:BX -> data or entry point
+	    CX = version number (CH = major, CL = minor)
+Call DVeop entry point with:
+	ES:DI -> callback address or 0000h:0000h to remove callback
+Return: AX = status
+h failed (callback table full or attempted to remove non-
+			existent callback)
+h successful
+		ES:DI -> chaining address
+	BX,CX,DX destroyed
+Notes:	the callback function is called with a simulated interrupt when the
+	  DESQview window containing it is closed; it should perform all
+	  necessary cleanup and then perform a FAR jump to the chaining address
+	  or an IRET if the chaining address is 0000h:0000h
+	if the program wishes to remove itself before the window is closed, it
+	  should call the DVeop entry point with the previously returned
+	  chaining address and ignore the returned chaining address.
+----------2FDE01BX7474-----------------------
+INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVTXDI.COM
+	AX = DE01h
+	BX = 7474h
+	CL = function
+h installation check
+		Return: AL = FFh
+h get process handle
+		DX = keys on Open Window menu (DL = first, DH = second)
+		Return: AX = process handle or 0000h if not running
+h (v1.3+) set TMAN handle
+		DX = TMAN process handle
+h (v1.3+) set open keys to ignore on next CL=01h call
+		DX = keys on Open Window menu (DL = first, DH = second)
+Return: BX = 4F4Bh ("OK")
+	DL destroyed
+Note:	DVTXDI is distributed as part of the shareware products DVTree (DOS
+	 shell/DESQview process manager) and DVTMAN by Mike Weaver
+----------2FDE01BX7575-----------------------
+INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVSIXDI.COM
+	AX = DE01h
+	BX = 7575h
+	CX = function
+h installation check
+		Return: AX = 00FFh if installed
+h turn on notification (currently unused)
+		Return: AX = 0001h
+h turn off notification (currently unused)
+		Return: AX = 0001h
+h get process information
+		Return: AX = status
+h failed
+h successful
+				BX = last instantaneous time slice
+					in 1/100s (v1.10)
+					in 1/18s (v1.11+)
+				CX = number of processes
+				DX = number of "(starting)" records (v2.00+)
+				SI = number of records in process info array
+				     (v2.00+) (always 15 for v1.x)
+				ES:DI -> process info array (see below)
+h get version
+		Return: AH = major version
+			AL = minor version
+h (v1.10+) get time since DESQview started
+		Return: DX:AX = 1/100s since DV start (v1.10)
+			DX:AX = 1/18s since DV start (v1.11+)
+h (v1.10+) get number of task switches
+		Return: DX:AX = total task switches
+			CX = task switches in last instantaneous interval
+Notes:	DVSIXDI is part of the DVSI (DESQview System Information) package by
+	  Daniel J. Bodoh
+	for v1.00, function 0003h allocates common memory, which the caller
+	  must deallocate after reading the process information; only the
+	  currently used records are placed in the buffer
+	for v1.10+, function 0003h merely returns a pointer to the internal
+	  array of process information; the caller should make a copy of the
+	  array while inside a critical section (see INT 15/AX=101Bh).	Only
+	  those records with bit 7 of the first byte set are valid.
+Format of information for one process (v1.00):
+Offset	Size	Description
+h	BYTE	flags
+		bit 7: process slot is valid
+h	WORD	offset into DESQVIEW.DVO of program's record if started from
+ 		Open Windows menu, else undefined
+h	WORD	Switch Windows window number
+h	WORD	segment of process handle
+h	WORD	number of tasks owned by process
+h	WORD	mapping context of process
+Bh	DWORD	hook for other programs
+Format of information for one process (v1.10-v2.00):
+Offset	Size	Description
+h	BYTE	flags
+		bit 7: valid record
+: (v2.00+) record is allocated; if bit 7 clear, process
+		    	is "(starting)" and only offsets 01h and 09h are valid
+: (v2.00+) this app currently owns the CPU
+: reserved (0)
+: DESQview system task
+: reserved (0)
+: task has keyboard (currently unused)
+: task swapped out (currently unused)
+h	WORD	Open Window keys
+h	WORD	Switch Windows number
+h	WORD	segment of process handle
+h	WORD	number of tasks for process
+h	WORD	process mapping context
+Bh	DWORD	time process started (relative to start of DESQview)
+Fh	DWORD	time process last got CPU (relative to start of DESQview)
+h	DWORD	time process last gave up CPU (relative to start of DESQview)
+h	DWORD	total CPU time since process started
+Bh	DWORD	CPU time at start of current instantaneous interval
+Fh	DWORD	CPU time in current instantaneous interval
+h	DWORD	hook for other programs
+Note:	all times are in 1/100s for v1.10, in 1/18s for v1.11+
+----------2FDE01BXFFFE-----------------------
+INT 2F U - DESQview v2.26+ XDI - DVXMS.DVR - ???
+	AX = DE01h
+	BX = FFFEh
+	CX = 4D47h ("MG")
+	DX = 0052h (0,"R")
+Return: AL = FFh
+	DX = 584Dh
+----------2FDE02-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - DV INITIALIZATION COMPLETE
+	AX = DE02h
+	BX = mapping context of DESQview
+	DX = handle of DESQview system task
+SeeAlso: AX=DE03h
+Note:	driver should pass this call to previous handler after doing its work
+----------2FDE03-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - DV TERMINATION
+	AX = DE03h
+	BX = mapping context of DESQview
+	DX = handle of DESQview system task
+SeeAlso: AX=DE02h
+Notes:	driver should pass this call to previous handler before doing its work
+	DESQview makes this call when it is exiting, but before unhooking any
+	  interrupt vectors
+----------2FDE04-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - ADD PROCESS
+	AX = DE04h
+	BX = mapping context of new process
+	DX = handle of process
+Return: nothing
+Notes:	XMS XDI handler (installed by default) allocates a 22-byte record
+	  (see below) from "common" memory to control access to XMS memory
+	all DOS, BIOS, and DV API calls are valid in handler
+	driver should pass this call to previous handler after processing it
+SeeAlso: AX=DE05h
+Format of XMS XDI structure:
+Offset	Size	Description
+h	DWORD	pointer to 10-byte record???
+h	DWORD	pointer to next XMS XDI structure
+h	WORD	mapping context
+Ah	BYTE	???
+Bh  5 BYTEs	XMS entry point to return for INT 2F/AX=4310h
+		(FAR jump to next field)
+h  6 BYTEs	FAR handler for XMS driver entry point
+		(consists of a FAR CALL followed by RETF)
+----------2FDE05-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - REMOVE PROCESS
+	AX = DE05h
+	BX = mapping context of process
+	DX = handle of last task in process
+Return: nothing
+Notes:	XMS XDI handler releases the structure allocated by AX=DE04h
+	driver should pass this call to previous handler before processing it
+	all DOS, BIOS, and DV API calls except those generating a task switch
+	  are valid in handler
+SeeAlso: AX=DE04h
+----------2FDE06-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - CREATE TASK
+	AX = DE06h
+	BX = mapping context of process containing task
+	DX = handle of new task
+Notes:	driver should pass this call to previous handler after processing it
+	all DOS, BIOS, and DV API calls are valid in handler
+----------2FDE07-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - TERMINATE TASK
+	AX = DE07h
+	BX = mapping context of process containing task
+	DX = handle of task
+Notes:	driver should pass this call to previous handler before processing it
+	all DOS, BIOS, and DV API calls except those generating a task switch
+	  are valid in handler
+----------2FDE08-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - SAVE STATE
+	AX = DE08h
+	BX = mapping context of task being switched from
+	DX = handle of task being switched from
+Notes:	invoked prior to task swap, interrupts, etc
+	driver should pass this call to previous handler after processing it
+----------2FDE09-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - RESTORE STATE
+	AX = DE09h
+	BX = mapping context of task being switched to
+	DX = handle of task being switched to
+Notes:	state is restored except for interrupts
+	driver should pass this call to previous handler before processing it
+----------2FDE0A-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - CHANGE KEYBOARD FOCUS
+	AX = DE0Ah
+	BX = mapping context of task receiving focus
+	DX = handle of running task
+Notes:	driver should pass this call to previous handler before processing it
+	this call often occurs inside a keyboard interrupt
+----------2FDE0B-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - DVP PROCESSING COMPLETE
+	AX = DE0Bh
+	BX = mapping context of DESQview system task
+	CX = number of system memory paragraphs required for the use of all
+		XDI drivers (DV will add this to system memory in DVP buffer)
+	DX = handle of DESQview system task
+	SI = mapping context of new process if it starts
+	ES:DI -> DVP buffer
+Return: CX incremented as needed
+Notes:	once DV invokes this function, the DVP buffer contents may be changed
+	driver should pass this call to previous handler before processing it
+----------2FDE0C-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - SWAP OUT PROCESS
+	AX = DE0Ch
+	BX = mapping context of task being swapped out
+	DX = handle of DESQview system task
+Note:	driver should pass this call to previous handler after processing it
+----------2FDE0D-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - SWAP IN PROCESS
+	AX = DE0Dh
+	BX = mapping context of process just swapped in
+	DX = handle of DESQview system task
+Note:	driver should pass this call to previous handler before processing it
+----------2FDE0E-----------------------------
+INT 2F - DESQview v2.26+ External Device Interface - DVP START FAILED
+	AX = DE0Eh
+	BX = mapping context of DESQview system task
+	DX = handle of DESQview system task
+	SI = mapping context of failed process (same as for call to AX=DE0Bh)
+Note:	driver should pass this call to previous handler after processing it
+----------2FDF--BX4448-----------------------
+INT 2F U - HyperDisk v4.20+ - INSTALLATION CHECK
+	AH = DFh
+	BX = 4448h ('DH')
+Return: AL = FFh if installed
+	    CX = 5948h ('YH')
+	    BX:DX -> ??? in resident portion if BX=4448h on entry
+Note:	HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
+SeeAlso: INT 13/AX=8EEDh
+----------2FE300-----------------------------
+INT 2F - ANARKEY.COM - INSTALLATION CHECK
+	AX = E300h
+Return: AL = 00h not installed
+	     FEh if installed but suspended (v3.0+)
+	     FFh installed
+Notes:	ANARKEY.COM is a commandline recall program by Steven Calwas
+	E3h is the default function number, but can be set to any value from
+	  C0h to FFh
+SeeAlso: AX=E301h,AX=E302h,AX=E303h,AX=E304h,AX=E305h,AX=E306h,AX=E307h
+----------2FE301-----------------------------
+INT 2F U - ANARKEY.COM v2+ - GET ???
+	AX = E301h
+Return: DX:BX -> ???
+SeeAlso: AX=E300h
+Format of returned data structure for ANARKEY v2.0:
+Offset	Size	Description
+ -7   7 BYTEs	signature ('ANARKEY')
+h	WORD	??? (I see 0001h in v2.0)
+h	WORD	??? (I see 0001h in v2.0)
+h	WORD	??? (I see 0 in v2.0)
+h	WORD	PSP segment of next program loaded
+Format of returned data structure for ANARKEY v3+:
+Offset	Size	Description
+ -1	BYTE	multiplex number
+h	WORD	??? (I see 0001h in v3.0-4.0)
+h	WORD	??? (I see 0001h in v3.0-4.0)
+h	BYTE	??? (I see 0 in v3.0-4.0)
+h	WORD	PSP segment of next program loaded
+----------2FE302-----------------------------
+INT 2F U - ANARKEY.COM v3+ - ???
+	AX = E302h
+	BL = ???
+Return: ???
+SeeAlso: AX=E300h
+----------2FE303-----------------------------
+INT 2F U - ANARKEY.COM v3+ - ANARKMD API
+	AX = E303h
+	BL = function
+h	toggle insert mode
+h	display contents of history buffer
+h	write history buffer to file
+		ES:DX -> file name
+h	clear history buffer
+h	undefine all aliases
+h	show aliases
+h	list programs using Unix switchar
+h	jump to bottom of history buffer
+h (v4.0) add string to history buffer
+		ES:DX -> ASCIZ string
+Ah (v4.0) ???
+		ES:DX -> ???
+Bh (v4.0) copy string to edit buffer for use as next input line
+		ES:DX -> ASCIZ string
+Ch (v4.0) ???
+Dh (v4.0) copy ??? to ???
+Eh (v4.0) ???
+Fh (v4.0) ???
+h (v4.0) set ??? flag
+h (v4.0) display error message about running in EMS under Windows
+Return: ???
+SeeAlso: AX=E300h
+----------2FE304-----------------------------
+INT 2F U - ANARKEY.COM v2+ - ???
+	AX = E304h
+	BL = ???
+Return: ???
+SeeAlso: AX=E300h
+----------2FE305-----------------------------
+INT 2F U - ANARKEY.COM v3+ - ENABLE/SUSPEND ANARKEY
+	AX = E305h
+	BL = new state
+h suspended
+h enabled
+SeeAlso: AX=E300h
+----------2FE306-----------------------------
+INT 2F U - ANARKEY.COM v4.0 - GET ???
+	AX = E306h
+Return: AX = ???
+SeeAlso: AX=E300h
+----------2FE307-----------------------------
+INT 2F U - ANARKEY.COM v4.0 - GET ???
+	AX = E307h
+Return: AX = ???
+	BL = ???
+SeeAlso: AX=E300h
+----------2FE44D-----------------------------
+INT 2F - NDOS - API
+	AX = E44Dh
+Note:	as NDOS is a licensed version of 4DOS v3.03, the API is identical to
+	  that for 4DOS, except that AH=E4h instead of D4h and the installation
+	  check returns AX=44EEh instead of AX=44DDh
+SeeAlso: AX=D44Dh,AX=E44Eh
+----------2FE44EBX0000-----------------------
+INT 2F - NDOS - AWAITING USER INPUT
+	AX = E44Eh
+	BX = 0000h NDOS is ready to display prompt
+	   = 0001h NDOS has displayed the prompt, about to accept user input
+Return: handler must preserve SI, DI, BP, SP, DS, ES, and SS
+SeeAlso: AX=E44Dh
+----------2FED00-----------------------------
+INT 2F - Phar Lap DOS EXTENDERS - INSTALLATION CHECK
+	AX = ED00h
+	BL = DOS extender
+h 286dosx v1.3+ (Software Development Kit)
+h 286dosx v1.3+ (Run-Time Kit)
+h 386dosx v4.0+ (SDK)
+h 386dosx v4.0+ (RTK)
+Return: AL = status
+h not installed
+	    FFh installed
+		SI = 5048h ("PH")
+		DI = 4152h ("AR")
+		CH = major version number
+		CL = minor version number
+		DX = flags
+		    bit 0: running under DPMI
+: running under Phar Lap VMM
+SeeAlso: AH=A1h,AX=F100h,AX=FBA1h
+----------2FEE00-----------------------------
+INT 2F - GRIDLOC.EXE - INSTALLATION CHECK
+	AX = EE00h
+Return: AL = FFh if installed
+Note:	GRIDLOC is a PC security program by Intelligent Security Systems, Inc.
+----------2FF000-----------------------------
+INT 2F U - 4MAP - INSTALLATION CHECK
+	AX = F000h
+Return: AX = 00FFh
+Notes:	returns AX=00FFh for any value of AL not listed here
+MAP is a keybinding program for 4DOS (see AX=D44Dh) by Ho-Ping Tseng
+----------2FF001-----------------------------
+INT 2F U - 4MAP - GET KEY MAPPINGS
+	AX = F001h
+Return: ES:BX -> key mappings
+SeeAlso: AX=F000h
+----------2FF002-----------------------------
+INT 2F U - 4MAP - INSERT CHARACTER INTO ???
+	AX = F002h
+	BL = character to insert
+Return: AX = status
+h successful
+h buffer full
+SeeAlso: AX=F000h,AX=F003h
+----------2FF003-----------------------------
+INT 2F U - 4MAP - INSERT CHARACTER INTO ???
+	AX = F003h
+	BL = character to insert
+Return: AX = status
+h successful
+h buffer full
+SeeAlso: AX=F000h,AX=F002h
+----------2FF1-------------------------------
+INT 2F U - MIN-MEM v2.11 - INSTALLATION CHECK
+	AH = F1h
+	AL <> F1h
+Return: AL = F1h if installed
+Note:	MIN-MEM is a shareware TSR manager by Biologic which permits up to 24
+	  popup TSRs to be loaded but swapped out to disk, EMS, or XMS.	 One
+	  TSR at a time is brought back into memory at the user's request.
+----------2FF100-----------------------------
+INT 2F - DOS EXTENDER INSTALLATION CHECK
+	AX = F100h
+Return: AL = FFh if DOS extender present
+	    SI = 444Fh ("DO")
+	    DI = 5358h ("SX")
+Note:	supported or soon to be supported by Phar Lap, Rational, Ergo, and IGC
+SeeAlso: AH=A1h,AX=ED00h,AX=FBA1h/BX=0081h,INT 15/AX=BF02h
+----------2FF700-----------------------------
+INT 2F - AUTOPARK.COM - INSTALLATION CHECK
+	AX = F700h
+Return: AL = 00h not installed
+	     FFh installed
+Note:	AUTOPARK.COM is a resident hard disk parker by Alan D. Jones
+----------2FF701-----------------------------
+INT 2F - AUTOPARK.COM - SET PARKING DELAY
+	AX = F701h
+	BX:CX = 32-bit count of 55ms timer ticks
+----------2FFB-------------------------------
+INT 2F - Multiplex - RESERVED BY BORLAND INTERNATIONAL
+	AH = FBh
+----------2FFB00-----------------------------
+INT 2F U - AutoBraille v1.1A - INSTALLATION CHECK
+	AX = FB00h
+Return: AX = 00FFh if installed
+Note:	AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
+SeeAlso: INT 10/AH=38h,INT 14/AX=F0F1h
+----------2FFB00-----------------------------
+INT 2F U - Jot-It! v1.50 - INSTALLATION CHECK
+	AX = FB00h
+Return: AX = FFFFh if installed
+	    BX = version (BCD, BH=major, BL=minor)
+SeeAlso: AX=FB03h"Jot-It",AX=FB01h"Jot-It"
+----------2FFB01-----------------------------
+INT 2F U - AutoBraille v1.1A - ???
+	AX = FB01h
+	???
+Return: ???
+----------2FFB01-----------------------------
+INT 2F U - Jot-It! v1.50 - GET USER NAME
+	AX = FB01h
+Return: DX:BX -> ASCIZ user name
+SeeAlso: AX=FB02h"Jot-It"
+----------2FFB02-----------------------------
+INT 2F U - AutoBraille v1.1A - ???
+	AX = FB02h
+Return: AH = ???
+	AL = ???
+----------2FFB02-----------------------------
+INT 2F U - Jot-It! v1.50 - GET MESSAGE DIRECTORY
+	AX = FB02h
+Return: DX:BX -> ASCIZ name of directory in which messages are stored
+SeeAlso: AX=FB01h"Jot-It"
+----------2FFB03-----------------------------
+INT 2F U - AutoBraille v1.1A - GET NEXT ???
+	AX = FB03h
+Return: AX = ???
+----------2FFB03-----------------------------
+INT 2F U - Jot-It! v1.50 - UNINSTALL
+	AX = FB03h
+Return: resident code removed from memory
+Note:	CAUTION: NO checks are performed to ensure that the interrupt vectors
+	  being unhooked (08h,09h,28h,2Fh) actually point at the Jot-It! code
+SeeAlso: AX=FB00h"Jot-It"
+----------2FFB-------------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AH = FBh
+	AL = 04h-08h
+Return: AX = 0000h
+----------2FFB-------------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AH = FBh
+	AL = 09h-0Fh (???, 0Eh = COM1, 0Fh = COM2)
+Return: ???
+Note:	AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
+----------2FFB-------------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AH = FBh
+	AL = 10h-1Fh
+	???
+Return: ???
+----------2FFB20-----------------------------
+INT 2F U - AutoBraille v1.1A - SET ??? FLAGS
+	AX = FB20h
+	BL = flags to set
+SeeAlso: AX=FB21h"AutoBraille"
+----------2FFB21-----------------------------
+INT 2F U - AutoBraille v1.1A - CLEAR ??? FLAGS
+	AX = FB21h
+	BL = flags to clear
+SeeAlso: AX=FB20h"AutoBraille"
+----------2FFB22-----------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AX = FB22h
+	BL = ???
+Note:	AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
+----------2FFB28-----------------------------
+INT 2F U - AutoBraille v1.1A - ???
+	AX = FB28h
+	BX = ???
+	???
+Return: ???
+SeeAlso: AX=FB29h"AutoBraille"
+----------2FFB29-----------------------------
+INT 2F U - AutoBraille v1.1A - ???
+	AX = FB29h
+	BX = ???
+	???
+Return: ???
+SeeAlso: AX=FB28h"AutoBraille"
+----------2FFB-------------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AH = FBh
+	AL = 2Bh-34h
+	BX = ???
+----------2FFB35-----------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AX = FB35h
+	BL = ???
+----------2FFB36-----------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AX = FB36h
+	BL = ???
+----------2FFB37-----------------------------
+INT 2F U - AutoBraille v1.1A - SET ???
+	AX = FB37h
+	BL = ???
+Note:	AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
+----------2FFB42BX0001-----------------------
+INT 2F PU - Borland C++ DPMILOAD.EXE - INSTALLATION CHECK???
+	AX = FB42h
+	BX = 0001h
+Return: AX = version number??? (AL=major, AH=minor)
+	CX = next-selector increment
+---BC2.0---
+	ES:BX -> 80-byte buffer for ???
+	DX = DPMI version
+---BC3.0---
+	BX = ??? (0000h)
+	DX = ???
+	ES:SI -> list of valid selectors ???
+Notes:	The version of DPMILOAD distributed with BC++ v2.0 identifies itself
+	  as version 1.000, while the version distributed with BC++ 3.0
+	  identifies itself as version 1.0; the former is 10864 bytes, the
+	  latter 22180 bytes.  The BC2.0 version is a DPMI loader, while
+	  the BC3.0 version also adds a DPMI host and DOS extender
+	the BC++ 2.0 version displays an error message if called with BX
+	  values other than 0001h-0008h
+----------2FFB42BX0002-----------------------
+INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - ALLOCATE MEMORY
+	AX = FB42h
+	BX = 0002h
+	CX = size in bytes
+	DX = bit flags
+	    bit 2: set to allocate DOS memory, clear for DPMI memory
+	SI = selector of descriptor to be modified to access allocated memory
+	DI = selector of a second descriptor to be modified
+Return: AX = ??? or 0000h on error
+	CX:DX = linear base address of DPMI memory block
+	SI:DI = handle for DPMI memory block or FFFFh:FFFFh
+	???
+Note:	two segment descriptors may be set if a code and an aliased data
+	  segment are required; if only one descriptor is needed, SI should
+	  equal DI on entry
+BUG:	when allocating DOS memory, the code computes the linear address by
+	  multiplying the segment number by 4 rather than shifting by 4
+SeeAlso: AX=FB42h/BX=0003h,AX=FB42h/BX=0008h
+----------2FFB42BX0002-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ALLOCATE MEMORY
+	AX = FB42h
+	BX = 0002h
+	ES:SI -> memory block info (see below)
+Return: ???
+Note:	The version of DPMILOAD distributed with BC++ v2.0 identifies itself
+	  as version 1.000, while the version distributed with BC++ 3.0
+	  identifies itself as version 1.0; the former is 10864 bytes, the
+	  latter 22180 bytes.
+SeeAlso: AX=FB42h/BX=0003h,AX=FB42h/BX=0008h
+Format of memory block info:
+Offset	Size	Description
+h	WORD	flags
+		bit 0: set if data segment rather than code segment
+		bit 1: information valid
+		bit 2: set if DOS memory block rather than DPMI memory block
+		bit 4: ???
+		bit 15: set if no LDT selectors for memory block???
+h	DWORD	block size in bytes
+---DPMI memory block---
+h	DWORD	DPMI memory block handle
+---DOS memory block---
+h	WORD	real-mode segment of memory block
+h	WORD	selector of memory block
+---
+Ah	DWORD	linear address of memory
+Eh	WORD	memory operation error code
+h no more free LDT descriptors
+---if flags bit 0 clear---
+h	WORD	code segment selector for memory block or 0000h or FFFFh
+h	WORD	data alias selector for memory block or 0000h or FFFFh
+---if flags bit 0 set---
+h	WORD	data segment selector for memory block or 0000h or FFFFh
+h	WORD	unused???
+----------2FFB42BX0003-----------------------
+INT 2F PU - Borland C++ DPMILOAD.EXE - GET AVAILABLE MEMORY
+	AX = FB42h
+	BX = 0003h
+Return: DX:AX = size of largest free block in paragraphs
+h:0000h on error (BC3.0 version only)
+Note:	AX and DX are destroyed on error, but no other error indicator is
+	  returned, under the BC++ 2.0 version of DPMILOAD
+SeeAlso: AX=FB42h/BX=0002h
+----------2FFB42BX0004-----------------------
+INT 2F PU - Borland C++ DPMILOAD.EXE - LOAD PROTECTED-MODE EXECUTABLE???
+	AX = FB42h
+	BX = 0004h
+	DS:DX -> ASCIZ filename of protected-mode executable
+Return: CX = selector of ??? or 0000h
+---BC3.0---
+	DX = status (0000h,FFF4h,others???) (see below)
+Note:	the filename may also be terminated by a CR rather than a NUL under the
+	  BC++ 3.0 version of DPMILOAD
+Values for status:
+h	successful
+h	??? failure
+h	invalid selector
+h	unknown error
+h	no more LDT descriptors available???
+ FFDEh	unable to set descriptor
+ FFDFh	unable to get segment base address
+ FFE0h	???
+ FFF2h	invalid parameter value
+ FFF4h	component of filename too long (name not in 8.3 format)
+ FFF5h	pathname too long (>79 chars)
+ FFF6h	???
+ FFF8h	???
+ FFF9h	index out of range
+ FFFAh	???
+ FFFCh	invalid access to code segment???
+ FFFEh	???
+ FFFFh	general error
+----------2FFB42BX0005-----------------------
+INT 2F PU - Borland C++ DPMILOAD.EXE - GET ADDRESS OF ??? BY NAME
+	AX = FB42h
+	BX = 0005h
+	CX = selector of DPMILOAD data (see below)
+	DS:DX -> ASCIZ or CR-terminated name of ??? (case ignored)
+Return: DX = status (see AX=FB42h/BX=0004h)
+h successful
+		AX:BX -> ??? FAR function (called with two words on top of stk)
+	    else
+		BX destroyed
+SeeAlso: AX=FB42h/BX=0006h,AX=FB42h/BX=000Eh
+Format of DPMILOAD data:
+Offset	Size	Description
+h 12 BYTEs	???
+Ch	WORD	??? bit flags
+Eh 14 BYTEs	???
+Ch	WORD	number of memory control records
+Eh 25 BYTEs	???
+h	BYTE	??? bit flags
+ 		bit 4: data valid???
+h  4 BYTEs	???
+Ch	WORD	???
+Eh 12 BYTEs	???
+h	BYTE	??? counter
+h	BYTE	???
+h	BYTE	???
+h	BYTE	???
+Ah	WORD	???
+Ch  2 BYTEs	???
+Eh	WORD	offset of array of 64-byte memory control records
+h	WORD	offset of name list (see below)
+h  4 BYTEs	???
+h	WORD	offset of array of 6-byte objects
+Ah  8 BYTEs	???
+h  9 BYTEs	ASCIZ name for ???
+Bh  9 BYTEs	ASCIZ name for ???
+ 	???
+Format of name list entry [array]:
+Offset	Size	Description
+h	BYTE	length of name (00h if end of array)
+h  N BYTEs	name
+ N+1	WORD	1-based index into array of unknown 6-byte objects
+Format of 6-byte objects:
+Offset	Size	Description
+h	BYTE	???
+h	BYTE	???
+h	BYTE	???
+h	BYTE	1-based index of memory control record
+h	WORD	???
+Format of memory control record:
+Offset	Size	Description
+h 20 BYTEs	memory block info (see AX=FB42h/BX=0002h)
+h  6 BYTEs	???
+Ah	BYTE	???
+Bh  2 BYTEs	???
+Dh	BYTE	??? bit flags
+Eh 14 BYTEs	???
+Ch	DWORD	pointer to ??? memory control record or 0000h:0000h
+h	DWORD	pointer to ??? memory control record or 0000h:0000h
+h	DWORD	pointer to next??? memory control record or 0000h:0000h
+h	DWORD	pointer to prev??? memory control record or 0000h:0000h
+Ch  4 BYTEs	???
+Note:	the pointers at offsets 2Ch and 30h form a doubly-linked list, as do
+	  the pointers at offsets 34h and 38h
+----------2FFB42BX0006-----------------------
+INT 2F PU - Borland C++ DPMILOAD.EXE - GET ADDRESS OF ??? BY NUMBER
+	AX = FB42h
+	BX = 0006h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	DX = 1-based index into array of ??? 6-byte objects
+Return: DX = status (see AX=FB42h/BX=0004h)
+h successful
+		AX:BX -> ??? FAR function (called with two words on top of stk)
+	    else
+		BX destroyed
+SeeAlso: AX=FB42h/BX=0005h,AX=FB42h/BX=000Eh
+----------2FFB42BX0007-----------------------
+INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0007h
+	CX = selector of ???
+Return: ???
+Note:	The version of DPMILOAD distributed with BC++ v2.0 identifies itself
+	  as version 1.000, while the version distributed with BC++ 3.0
+	  identifies itself as version 1.0; the former is 10864 bytes, the
+	  latter 22180 bytes.
+----------2FFB42BX0007-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0007h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	???
+Return: DX = status (see AX=FB42h/BX=0004h)
+h successful
+		AX = ???
+----------2FFB42BX0008-----------------------
+INT 2F PU - Borland C++ 2.0 DPMILOAD.EXE - FREE MEMORY BLOCK
+	AX = FB42h
+	BX = 0008h
+	CX = bit flags
+	    bit 2: set if DPMI memory, clear if DOS memory
+	DX = selector of DOS memory block
+	SI:DI = handle of DPMI memory block
+Return: DX = 0000h on error, unchanged if succcessful
+Note:	The version of DPMILOAD distributed with BC++ v2.0 identifies itself
+	  as version 1.000, while the version distributed with BC++ 3.0
+	  identifies itself as version 1.0; the former is 10864 bytes, the
+	  latter 22180 bytes.
+SeeAlso: AX=FB42h/BX=0002h
+----------2FFB42BX0008-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - FREE MEMORY BLOCK
+	AX = FB42h
+	BX = 0008h
+	ES:SI -> memory block info (see AX=FB42h/BX=0002h"3.0")
+Return: ???
+SeeAlso: AX=FB42h/BX=0009h
+----------2FFB42BX0009-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - RESIZE MEMORY BLOCK
+	AX = FB42h
+	BX = 0009h
+	ES:SI -> memory block info (see AX=FB42h/BX=0002h"3.0")
+	???
+Return: ???
+SeeAlso: AX=FB42h/BX=0008h"3.0"
+----------2FFB42BX000A-----------------------
+INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - INIT DPMI HOST AND SPAWN SUBSHELL
+	AX = FB42h
+	BX = 000Ah
+	CX = 0001h
+	DX = ???
+	SI = ???
+Return: after user exits subshell
+Notes:	this call is used by DPMIRES; unlike most of the DPMILOAD calls, this
+	  function is not available in protected mode.
+	the BC2.0 version of DPMILOAD is purely a DPMI loader, while the BC3.0
+	  version also adds a DPMI host and DOS extender.
+SeeAlso: AX=FB42h/BX=0004h,AX=FB42h/BX=0015h
+----------2FFB42BX000B-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - UNUSED
+	AX = FB42h
+	BX = 000Bh
+----------2FFB42BX000C-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - FREE DESCRIPTORS FOR MEMORY BLOCK???
+	AX = FB42h
+	BX = 000Ch ???
+	ES:SI -> memory block info ??? (see AX=FB42h/BX=0002h"3.0")
+Return: DX = status???
+SeeAlso: AX=FB42h/BX=000Fh
+----------2FFB42BX000D-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SIMULATE REAL MODE INTERRUPT
+	AX = FB42h
+	BX = 000Dh
+	CX = number of words to copy from protected-mode to real mode stack
+	DL = interrupt number
+	DH = flags
+	    bit 0: reset the interrupt controller and A20 line
+	ES:DI -> real-mode call structure (see INT 31/AX=0300h)
+Return: CX = status
+h successful
+h failed
+SeeAlso: INT 31/AX=0300h
+----------2FFB42BX000E-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ADDRESS OF ???
+	AX = FB42h
+	BX = 000Eh
+	DS:DX -> ASCIZ or CR-terminated name of ???
+Return: CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h) corresponding to
+		name, 0000h on error
+SeeAlso: AX=FB42h/BX=0006h,AX=FB42h/BX=001Fh
+----------2FFB42BX000F-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - REALLOCATE LDT DESCRPS TO MEMBLK???
+	AX = FB42h
+	BX = 000Fh
+	ES:SI -> memory block info (see AX=FB42h/BX=0002h"3.0")
+Return: ???
+SeeAlso: AX=FB42h/BX=000Ch
+----------2FFB42BX0010-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - CONVERT SEGMENT TO SELECTOR
+	AX = FB42h
+	BX = 0010h
+	DX = segment number
+Return: CX = status (see also AX=FB42h/BX=0004h)
+h successful
+		DX = selector number for descriptor
+h failed
+SeeAlso: AX=FB42h/BX=0023h
+----------2FFB42BX0011-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0011h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		AX:BX -> ??? name
+h invalid selector
+	    FFFEh ??? error
+----------2FFB42BX0012-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0012h
+	CX = selector for ???
+Return: CX = selector for ???
+----------2FFB42BX0013-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0013h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	DX = 1-based index of ???
+Return: CX = status (see also AX=FB42h/BX=0004h)
+h successful
+		BX = ??? or 0000h
+h invalid selector
+	    FFF9h ??? error
+----------2FFB42BX0014-----------------------
+INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0014h ???
+		CX = 0001h
+		Return: BX = 0000h
+Note:	unlike most of the DPMILOAD functions, this call is available only in
+	  real or V86 mode
+SeeAlso: AX=FB42h/BX=000Ah
+----------2FFB42BX0015-----------------------
+INT 2F RU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0015h uninstall
+	CX = 0001h
+Return: ???
+Note:	unlike most of the DPMILOAD functions, this call is available only in
+	  real or V86 mode
+SeeAlso: AX=FB42h/BX=000Ah
+----------2FFB42BX0016-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
+	AX = FB42h
+	BX = 0016h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		CX = ???
+----------2FFB42BX0017-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0017h
+	CX = ???
+	DX = ???
+	???
+Return: DX = status (0000h,0001h) (see below)
+----------2FFB42BX0018-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET ???
+	AX = FB42h
+	BX = 0018h
+	CX = ???
+----------2FFB42BX0019-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0019h
+	CX = selector for ???
+	???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		CX = selector for ???
+----------2FFB42BX001A-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 001Ah
+	CX = selector for ???
+	???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+h failed
+	CX:BX -> ???
+----------2FFB42BX001B-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 001Bh
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	DX = offset of ???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		BX = selector for ???
+		CX = selector for ???
+h invalid selector
+----------2FFB42BX001C-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 001Ch
+	ES = selector for DPMILOAD data (see AX=FB42h/BX=0005h)
+	CX = 1-based index of ???
+	DX = 1-based index of ???
+Return: DX = status (0000h,0002h,FFF9h) (see AX=FB42h/BX=0004h)
+----------2FFB42BX001D-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
+	AX = FB42h
+	BX = 001Dh
+Return: CX:DX = ???
+----------2FFB42BX001E-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 001Eh
+	CX = ???
+	???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+	    FFF7h ??? error
+	CX:BX -> ???
+----------2FFB42BX001F-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ADDRESS OF ???
+	AX = FB42h
+	BX = 001Fh
+	DS:DX -> 8-character name of ???
+	???
+Return: CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h) for ???
+h on error
+SeeAlso: AX=FB42h/BX=000Eh
+----------2FFB42BX0020-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - NULL FUNCTION???
+	AX = FB42h
+	BX = 0020h
+Return: DX = ??? (always 0000h)
+----------2FFB42BX0021-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET PROCESSOR EXCEPTION HANDLER VECT
+	AX = FB42h
+	BX = 0021h
+	CL = exception number (00h-1Fh)
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		AX:BX = selector:offset of handler
+	    FFF2h unable to get exception handler vector
+SeeAlso: AX=FB42h/BX=0022h,AX=FB42h/BX=0024h,INT 31/AX=0202h
+----------2FFB42BX0022-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET PROCESSOR EXCEPTION HANDLER VECT
+	AX = FB42h
+	BX = 0022h
+	CL = exception number (00h-1Fh)
+	SI:DX = selector:offset of new handler
+Return: DX = status (0000h,0004h,FFF2h) (see AX=FB42h/BX=0004h)
+SeeAlso: AX=FB42h/BX=0021h,AX=FB42h/BX=0025h,INT 31/AX=0203h
+----------2FFB42BX0023-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - CONVERT SELECTOR TO SEGMENT NUMBER
+	AX = FB42h
+	BX = 0023h
+	CX = selector
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		CX = real-mode segment number
+	    FFF2h descriptor has invalid base address for real-mode segment
+SeeAlso: AX=FB42h/BX=0010h
+----------2FFB42BX0024-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET PROTECTED-MODE INTERRUPT VECTOR
+	AX = FB42h
+	BX = 0024h
+	CL = interrupt number
+Return: DX = status (0000h) (see also AX=FB42h/BX=0004h)
+	AX:BX = selector:offset of handler
+SeeAlso: AX=FB42h/BX=0025h,INT 31/AX=0204h
+----------2FFB42BX0025-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - SET PROTECTED-MODE INTERRUPT VECTOR
+	AX = FB42h
+	BX = 0025h
+	CL = interrupt number
+	SI:DX = selector:offset of new handler
+Return: DX = status (0000h,0004h,FFF2h) (see AX=FB42h/BX=0004h)
+SeeAlso: AX=FB42h/BX=0024h,INT 31/AX=0205h
+----------2FFB42BX0026-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - ???
+	AX = FB42h
+	BX = 0026h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	DX = 1-based index of ???
+	???
+Return: DX = status (0000h,0002h,FFF9h) (see AX=FB42h/BX=0004h)
+h successful
+	    	BX = offset of ??? within data structure
+----------2FFB42BX0027-----------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - GET ???
+	AX = FB42h
+	BX = 0027h
+	CX = selector of DPMILOAD data (see AX=FB42h/BX=0005h)
+	DX = offset of ???
+Return: DX = status (see also AX=FB42h/BX=0004h)
+h successful
+		BX = ???
+----------2FFB42BX0080-----------------------
+INT 2F U - ??? - CALLED BY Borland C++ 3.0 DPMILOAD.EXE
+	AX = FB42h
+	BX = 0080h
+	???
+Return: AX = ???
+	???
+----------2FFB42BX0081-----------------------
+INT 2F U - ??? - CALLED BY Borland C++ 3.0 DPMILOAD.EXE
+	AX = FB42h
+	BX = 0081h
+	???
+Return: AX = ???
+	???
+----------2FFB43-----------------------------
+INT 2F PU - Borland C++ 3.0 DPMILOAD.EXE - NULL FUNCTION
+	AX = FB43h
+	BX = subfunction (at least 0000h-000Eh)
+Notes:	this function is only present in protected mode; it does nothing but
+	  an immediate IRET
+	DPMILOAD.EXE itself calls various subfunctions:
+	    subfunction 0004h is called with CX=selector of ???, DI=selector
+	    	of DPMILOAD data
+	    subfunction 0008h is called with CX=selector of DPMILOAD data
+----------2FFB64-----------------------------
+INT 2F U - AutoBraille v1.1A - GET ???
+	AX = FB64h
+Return: AX = ??? (0006h seen)
+Note:	AutoBraille is a shareware text-to-braille converter by KANSYS, Inc.
+----------2FFBA1BX0081-----------------------
+INT 2F U - TKERNEL (Borland DOS extender) - INSTALLATION CHECK
+	AX = FBA1h
+	BX = 0081h
+	ES:DI -> 16-byte buffer
+Return: if installed, first four bytes of ES:DI buffer are "IABH"
+Note:	TKERNEL is a licensed version of AI Architects/Ergo's OS/x86.  It was
+	  present only in Borland C++ 2.0; with version 3.0, the DOS extender
+	  was moved into DPMILOAD.
+SeeAlso: AH=A1h,AX=F100h,AX=FBA1h/BX=0082h,AX=FBA1h/BX=0084h,INT 15/AX=BF02h
+SeeAlso: INT 21/AX=4403h"TKERNEL"
+----------2FFBA1BX0082-----------------------
+INT 2F U - TKERNEL (Borland DOS extender) - GET ENTRY POINT
+	AX = FBA1h
+	BX = 0082h
+	ES:DI -> response buffer (see below)
+Return: ES:DI buffer filled
+SeeAlso: AX=FBA1h/BX=0081h,AX=FBA1h/BX=0084h
+Format of response buffer:
+Offset	Size	Description
+h  4 BYTEs	signature "IABH"
+h	DWORD	pointer to FAR extender entry point
+Call entry point with:
+	AX = function number
+h initialize???
+	    	STACK:  WORD  ???
+		Return: AX = status???
+			STACK unchanged
+h get version???
+	    	Return: AX = 0200h for v2.0.34
+h get ???
+	    	Return: AX = ??? (011Eh or 0182h seen)
+h load protected-mode executable
+	    	STACK:	DWORD -> ASCIZ filename of executable
+			DWORD	???
+			DWORD -> program arguments (counted string plus CR)
+			DWORD -> environment for protected-mode executable
+				(terminated with two consecutive NULs)
+			DWORD -> WORD buffer for ???
+		Return:	AX = status???
+			STACK unchanged
+h get descriptor
+	        STACK:	WORD	selector for which to get descriptor
+			WORD	segment number (when running in real mode)
+			DWORD -> buffer for descriptor
+		Return: CF clear if successful
+			    buffer filled
+			CF set on error
+			    AX destroyed???
+			STACK unchanged
+h ???
+	    	STACK:	WORD 	selector for ???
+			WORD 	subfunction number???
+h run previously-loaded program???
+h ??? (similar to 0000h)
+h
+h
+h ??? (similar to 0000h and 0001h)
+		Return: AX = status???
+			STACK unchanged
+h ???
+	    	STACK:	WORD ???
+			DWORD -> WORD (call) max iterations of ???
+				      (return) remaining iterations
+		Return: AX = ???
+			STACK unchanged
+h unused
+	    	Return: AX = 0001h
+h unused
+	    	Return: AX = 0001h
+h copy protected-mode memory into conventional memory
+	    	STACK:  WORD 	selector for source segment
+			WORD	segment of source if in real mode???
+			DWORD	offset of source
+			WORD 	number of bytes to copy
+			DWORD -> low-memory destination
+		Return: AX = status
+			STACK unchanged
+Ah copy conventional memory into protected-mode memory
+	    	STACK:  WORD	selector for destination segment
+			WORD 	segment of destination if in real mode???
+			DWORD	offset of destination
+			WORD 	number of bytes to copy
+			DWORD -> low-memory source
+		Return: AX = status
+			STACK unchanged
+Bh get ??? pointers
+	    	STACK:	WORD desired pointer
+h get ???
+h get protected-mode CR3
+h get 4K page table buffer pointer
+				else Return: DX:AX = FFFFh:FFFFh
+		Return: DX:AX = requested pointer
+			STACK unchanged
+Ch set ??? pointers
+	    	STACK:	WORD desired pointer
+h set ???
+h set protected-mode CR3
+h set 4K page table buffer pointer
+				else ignore
+			DWORD new value for pointer
+		Return: STACK unchanged
+Dh get ??? pointers
+	    	STACK:	WORD desired pointer
+h get ???
+h get ???
+h get ???
+h get ???
+h get ???
+h get ???
+h get ???
+h get ???
+				else Return: DX:AX = FFFFh:FFFFh
+		Return: DX:AX = desired pointer
+			STACK unchanged
+Eh set ??? pointer
+	    	STACK:	WORD desired pointer
+h set ???
+h set ???
+h set ???
+h set ???
+h set ???
+h set ???
+h set ???
+h set ???
+				else Return: DX:AX = FFFFh:FFFFh
+		Return: STACK unchanged
+Fh get ???
+	    	Return: AX = ??? (seen 0008h)
+h get ???
+	    	Return: AX = ???
+h determine whether selector is valid
+	    	STACK:	WORD	possible selector
+		Return: AX = selector or 0000h if invalid
+			STACK unchanged
+h get physical address
+	    	STACK:	WORD	selector for desired segment
+			WORD	segment number if in real mode
+			DWORD	offset within segment
+		Return: DX:AX = 32-bit physical address or 00000000h on error
+			BX destroyed
+			STACK unchanged
+h ???
+	        Note:	normally jumps to code for function 0012h
+h copy protected-mode memory to conventional memory, with ???
+	    	STACK:  WORD	selector for source segment
+			WORD	segment of source if in real mode???
+			DWORD	offset of source
+			WORD	number of bytes to copy
+			DWORD -> low-memory destination
+		Return: AX = status???
+			STACK unchanged
+h copy conventional memory to protected-mode memory, with ???
+	    	STACK:  WORD	selector for destination segment
+			WORD	segment of destination if in real mode???
+			DWORD	offset of destination
+			WORD	number of bytes to copy
+			DWORD -> low-memory source
+		Return: AX = status???
+			STACK unchanged
+h set ??? pointer
+	    	STACK:	WORD	unused
+			DWORD -> ??? or 0000h:0000h
+		Return: AX = 0000h
+			STACK unchanged
+h allocate real-mode procedure???
+	    	STACK:	DWORD	ASCIZ name of procedure
+			DWORD ???
+			DWORD	address of subroutine to invoke
+		Return: AX = status
+h procedure by that name exists
+h no more real-mode procedures available
+			DX destroyed
+			STACK unchanged
+h unused
+	    	Return: AX = 0001h
+h get parameter block
+	    	Return: DX:AX -> parameter block (format unknown at this time,
+				but 92h bytes)
+				(preceded by signature "!!PARAM-BLOCK!!")
+Ah get ???
+	    	Return: AX = ??? (0148h seen)
+Bh free real-mode procedure???
+	    	STACK:	DWORD -> ASCIZ name of procedure
+		Return: ???
+			STACK unchanged
+Ch check whether packets from protected mode task pending
+	    	Return: AX = 0001h if packets pending, 0000h if not
+Dh set ???
+	    	STACK:	DWORD ??? or 0000h:0000h
+		Return: AX,BX destroyed
+			STACK unchanged
+Eh ???
+	    	STACK:	WORD ??? (high byte ignored)
+			DWORD -> data structure (see below)
+		Return: AX,BX,CX,DX destroyed
+			data structure updated
+			STACK unchanged
+		Format of data structure
+		Offset	Size	Description
+h  2 BYTEs	unused
+h	WORD	???
+h	WORD	???
+h	WORD	???
+h  2 BYTEs	unused
+Ah	WORD	???
+Ch	WORD	(call) ???
+		 		(return) offset of this data structure (BUG?)
+Fh set ???
+	    	STACK:	WORD ??? (set to 0001h if zero)
+		Return: AX destroyed
+			STACK unchanged
+h ???
+	    	STACK:	DWORD -> ??? (8 bytes of data)
+		Return: AX = ???
+			STACK unchanged
+h ???
+	    	STACK:	DWORD -> ??? (8 bytes of data)
+			WORD	???
+			WORD	???
+		Return: AX = ???
+			STACK unchanged
+h ???
+	    	STACK:	DWORD -> ??? (8 bytes of data)
+			DWORD -> 4-byte buffer for results
+		Return: AX = ???
+			STACK unchanged
+h ???
+	    	STACK:	DWORD -> ??? (8 bytes of data)
+		Return: AX = ???
+			STACK unchanged
+h set ???
+	    	STACK:	WORD ???
+		Return: AX destroyed
+			STACK unchanged
+h get ???
+	    	Return: AX = ??? (value set with func 0024h)
+h BUG: jumps to hyperspace due to fencepost error
+	    FFFFh set DOS memory management functions
+		BX:SI -> FAR routine for allocating DOS memory
+			(called with AH=48h,BX=number of paragraphs to alloc;
+			 returns CF clear, AX=segment of allocated memory, or
+			 	 CF set on error)
+		CX:DI -> FAR routine for freeing DOS memory
+			(called with AH=49h,ES=segment of block to free;
+			 returns CF set on error,AX=error code)
+		Note: each of these pointers normally points at INT 21/RETF
+	    other Return: AX = 0001h
+Note:	BX may be destroyed by any of the API calls
+----------2FFBA1BX0084-----------------------
+INT 2F U - TKERNEL (Borland DOS extender) - UNINSTALL
+	AX = FBA1h
+	BX = 0084h
+	ES:DI -> response buffer (see below)
+Return: ES:DI buffer filled
+SeeAlso: AX=FBA1h/BX=0081h,AX=FBA1h/BX=0084h
+Format of response buffer:
+Offset	Size	Description
+h  4 BYTEs	signature "IABH"
+h	WORD	success indicator
+h failed (INT 2F hooked by another program)
+		unchanged if successful
+h	WORD	segment of ???
+h	WORD	segment of ??? memory block to free if nonzero
+Ah	WORD	segment of ??? memory block to free if nonzero
+----------2FFBFBES0000-----------------------
+INT 2F U - SoundBlaster speech driver - INSTALLATION CHECK
+	AX = FBFBh
+	ES = 0000h
+Return: ES nonzero if installed
+	    ES:BX -> entry point data structure (see below)
+SeeAlso: INT 80/BX=0000h,INT F3"SoundBlaster"
+Format of entry point data structure:
+Offset	Size	Description
+h  3 BYTEs	signature "FB "
+h	BYTE	driver major version number???
+h	DWORD	speech driver entry point
+h 24 BYTEs	???
+h  ? BYTEs	data buffer for calling speech driver
+Call driver entry point with:
+	AL = function
+h speak a string
+	    	data buffer (see above) contains:
+			BYTE  length of string
+		      N BYTEs string to speak
+----------2FFE00DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ TSRs - INSTALLATION CHECK/STATUS REPORT
+	AX = FE00h
+	DI = 4E55h ("NU")
+	SI = TSR identifier
+h ("CF") NCACHE-F (v5) / NCACHE (v6.0+)
+h ("CS") NCACHE-S (v5 only)
+h ("DC") DISKREET
+Dh ("DM") DISKMON
+h ("FS") FILESAVE (v5) / EP (v6.0+)
+Return: SI = TSR reply
+	    lowercase version of SI on entry (i.e. SI OR 2020h)
+	AH = status
+h installed but disabled internally
+h installed and enabled
+	AL = status
+h	NCACHE-x or DISKREET installed
+h FILESAVE / EP / DISKMON v6 installed
+h	DISKMON v5 installed
+	BX = length of *.INI file (DISKMON and FILESAVE/EP only) (see below)
+	CX = segment of resident portion
+	    FFFFh if completely loaded high (NCACHE)
+---FILESAVE/EP---
+	DL = ??? (apparently always 00h)
+---DISKMON---
+	DX = ??? (apparently always 1AE6h [v5] / 1B86h [v6])
+Note:	the value returned in CX is incorrect for NCACHE 6.00
+SeeAlso: AX=FE01h,AX=FE02h,AX=FE03h,AX=FE04h,AX=FE05h
+Format of DISKMON.INI file:
+Offset	Size	Description
+-6Ch 108 BYTEs	(in memory copy only)
+		list of filenames which are always protected:
+		  IBMBIO.COM/IBMDOS.COM, IO.SYS/MSDOS.SYS, TBIOS.SYS/TDOS.SYS,
+		  MIO.SYS/IO.BIN, COMMAND.COM
+h	BYTE	??? always 01h
+h	BYTE	disk light (00h off, 01h on)
+h	BYTE	disk protection (00h off, 01h on)
+h	BYTE	protected areas
+h system area
+h files
+h system area and files
+h entire disk
+h	BYTE	floppy access (00h not allowed, 01h allowed)
+h 27 BYTEs	filename extension list (9 entries)
+		(lowercase, blank padded or = 000000h)
+h 240 BYTEs	filename list (20 entries)
+		(lowercase, name and extension blank padded, with '.')
+Note:	CX:0508h -> copy in installed TSR (v5)
+	CX:052Fh -> copy in installed TSR (v6)
+Format of FILESAVE.INI / EP.INI file:
+Offset	Size	Description
+h 26 BITs	drive list (bit set: file protection on, cleared: off):
+h	BYTE	drives	A: - H:
+h	BYTE	drives	I: - P:
+h	BYTE	drives	Q: - X:
+h	BYTE	drives	Y: - Z:
+h	BYTE	which files to protect
+h all files
+h all files with extension in list
+h all files except those with extension in list
+h 27 BYTEs	filename extension list (9 entries, uppercase, ASCIZ)
+h	BYTE	include files with archive bit clear (00h no, 01h yes)
+h	WORD	number of days after which files are purged (0 = never)
+h	WORD	max kilobytes of erased file space to hold (0 = all)
+Note:	CX:03D2h -> copy in installed TSR (v5.0)
+	CX:03F5h -> copy in installed TSR (v6.0)
+----------2FFE01DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ TSRs - ENABLE
+	AX = FE01h
+	DI = 4E55h ("NU")
+	SI = TSR identifier (see AX=FE00h)
+Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
+	AX = status
+h successful (DISKMON, FILESAVE, EP)
+	    FE00h successful (NCACHE-x, DISKREET)
+Notes:	if the enable/disable calls are used on DISKMON or NCACHE-x, the status
+	  report generated by the programs still indicates the previous state,
+	  and DISKMON.INI is not updated
+	apparently has no effect on DISKREET
+SeeAlso: AX=FE00h,AX=FE02h
+----------2FFE02DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ TSRs - DISABLE
+	AX = FE02h
+	DI = 4E55h ("NU")
+	SI = TSR identifier (see AX=FE00h)
+Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
+	AX = status
+h successful (DISKMON, FILESAVE)
+	    FE00h successful (NCACHE-x, DISKREET)
+Note:	(see AX=FE01h)
+SeeAlso: AX=FE00h,AX=FE01h
+----------2FFE03DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ TSRs - internal - ???
+	AX = FE03h
+	DI = 4E55h ("NU")
+	SI = TSR identifier (see AX=FE00h)
+Return: SI = TSR reply (lowercase version of entry SI, i.e. SI OR 2020h)
+	AX = status
+h successful???
+Notes:	only supported by DISKMON, FILESAVE, and NCACHE-x
+	reportedly dangerous
+SeeAlso: AX=FE00h
+----------2FFE04DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ DISKMON, FILESAVE / EP - internal - ???
+	AX = FE04h
+	DI = 4E55h ("NU")
+	SI = TSR identifier (see AX=FE00h)
+Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
+	AX = status
+h successful???
+SeeAlso: AX=FE00h
+----------2FFE05DI4E55-----------------------
+INT 2F U - NORTON UTILITIES 5.0+ DISKMON, FILESAVE / EP - internal - ???
+	AX = FE05h
+	DI = 4E55h ("NU")
+	SI = TSR identifier (see AX=FE00h)
+Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
+	AX = status
+Ah successful???
+Note:	reportedly dangerous
+SeeAlso: AX=FE00h
+----------2FFF00-----------------------------
+INT 2F - Topware Network Operating System - INSTALLATION CHECK
+	AX = FF00h
+Return: AL = 00h not installed, OK to install
+	   = 01h not installed, not OK to install
+	   = FFh installed
+SeeAlso: AX=FF01h,INT 21/AH=FFh"Topware",INT 7A"Topware"
+----------2FFF01-----------------------------
+INT 2F - Topware Network Operating System - GET VERSION
+	AX = FF01h
+Return: AX = version
+SeeAlso: AX=FF00h
+----------30---------------------------------
+INT 30 - (NOT A VECTOR!) - DOS 1+ - FAR JMP instruction for CP/M-style calls
+   the CALL 5 entry point does a FAR jump to here
+Note:	under DOS 2+, the instruction at PSP:0005 points two bytes too low in
+	  memory
+SeeAlso: INT 21/AH=26h

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