Offset	Size	Description	(Table 03101)
 00h	BYTE	flags
		bit 7: process slot is valid
 01h	WORD	offset into DESQVIEW.DVO of program's record if started from
		  Open Windows menu, else undefined
 03h	WORD	Switch Windows window number
 05h	WORD	segment of process handle
 07h	WORD	number of tasks owned by process
 09h	WORD	mapping context of process (see #00416 at INT 15/AX=1016h)
 0Bh	DWORD	hook for other programs

Format of DVSIXDI v1.10-v2.00 information for one process:
Offset	Size	Description	(Table 03102)
 00h	BYTE	process flags (see #03103)
 01h	WORD	Open Window keys
 03h	WORD	Switch Windows number
 05h	WORD	segment of process handle
 07h	WORD	number of tasks for process
 09h	WORD	process mapping context
 0Bh	DWORD	time process started (relative to start of DESQview)
 0Fh	DWORD	time process last got CPU (relative to start of DESQview)
 13h	DWORD	time process last gave up CPU (relative to start of DESQview)
 17h	DWORD	total CPU time since process started
 1Bh	DWORD	CPU time at start of current instantaneous interval
 1Fh	DWORD	CPU time in current instantaneous interval
 23h	DWORD	hook for other programs
Note:	all times are in 1/100s for v1.10, in 1/18s for v1.11+

Bitfields for DVSIXDI process flags:
Bit(s)	Description	(Table 03103)
 7	valid record
 6	(v2.00+) record is allocated; if bit 7 clear, process is "(starting)"
	  and only offsets 01h and 09h are valid
 5	(v2.00+) this app currently owns the CPU
 4	reserved (0)
 3	DESQview system task
 2	reserved (0)
 1	task has keyboard (currently unused)
 0	task swapped out (currently unused)
--------Q-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
--------Q-2FDE02-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV INITIALIZATION COMPLETE
	AX = DE02h
	BX = mapping context of DESQview
	DX = handle of DESQview system task
Note:	driver should pass this call to previous handler after doing its work
SeeAlso: AX=DE03h,AX=DE0Fh,INT 15/AX=5400h
--------Q-2FDE03-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - DV TERMINATION
	AX = DE03h
	BX = mapping context of DESQview
	DX = handle of DESQview system task
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
SeeAlso: AX=DE02h,AX=DE0Fh,INT 15/AX=5407h
--------Q-2FDE04-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - ADD PROCESS
	AX = DE04h
	BX = mapping context of new process (see #00416 at INT 15/AX=1016h)
	DX = handle of process
Return: nothing
Notes:	XMS XDI handler (installed by default) allocates a 22-byte record
	  (see #03104) 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,AX=DE06h,INT 15/AX=5401h

Format of XMS XDI structure:
Offset	Size	Description	(Table 03104)
 00h	DWORD	pointer to 10-byte record???
 04h	DWORD	pointer to next XMS XDI structure
 08h	WORD	mapping context
 0Ah	BYTE	???
 0Bh  5 BYTEs	XMS entry point to return for INT 2F/AX=4310h"XMS"
		(FAR jump to next field)
 10h  6 BYTEs	FAR handler for XMS driver entry point
		(consists of a FAR CALL followed by RETF)
--------Q-2FDE05-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - REMOVE PROCESS
	AX = DE05h
	BX = mapping context of process (see #00416 at INT 15/AX=1016h)
	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,AX=DE07h,INT 15/AX=5402h
--------Q-2FDE06-----------------------------
INT 2F C - DESQview v2.26+ External Dev 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
--------Q-2FDE07-----------------------------
INT 2F C - DESQview v2.26+ External Dev 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
SeeAlso: AX=DE04h,AX=DE06h,AX=DE10h
--------Q-2FDE08-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SAVE STATE
	AX = DE08h
	BX = mapping context of task being switched from
	      (see #00416 at INT 15/AX=1016h)
	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
SeeAlso: AX=DE09h,INT 15/AX=5403h,INT 15/AX=DE27h
--------Q-2FDE09-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - RESTORE STATE
	AX = DE09h
	BX = mapping context of task being switched to
	      (see #00416 at INT 15/AX=1016h)
	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
SeeAlso: AX=DE08h,INT 15/AX=5404h,INT 15/AX=DE27h
--------Q-2FDE0A-----------------------------
INT 2F C - DESQview v2.26+ External Dev 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
	DV 2.42 does not provide this call to XDI handlers running inside a
	  window; instead, it directly calls the INT 2F handler which was
	  active at the time DV started
SeeAlso: INT 15/AX=DE26h,INT 15/AX=DE2Fh
--------Q-2FDE0B-----------------------------
INT 2F C - DESQview v2.26+ External Dev 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
--------Q-2FDE0C-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP OUT PROCESS
	AX = DE0Ch
	BX = mapping context of task being swapped out
	      (see #00416 at INT 15/AX=1016h)
	DX = handle of DESQview system task
Note:	driver should pass this call to previous handler after processing it
--------Q-2FDE0D-----------------------------
INT 2F C - DESQview v2.26+ External Dev Interface - SWAP IN PROCESS
	AX = DE0Dh
	BX = mapping context of process just swapped in
	      (see #00416 at INT 15/AX=1016h)
	DX = handle of DESQview system task
Note:	driver should pass this call to previous handler before processing it
--------Q-2FDE0E-----------------------------
INT 2F C - DESQview v2.26+ External Dev 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
--------Q-2FDE0F-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - INITIALIZE DV
	AX = DE0Fh
Note:	DESQview 2.50+ calls this function just before it completes its
	  initialization.  At the time of the call, DESQview has not yet
	  changed any interrupt vectors
SeeAlso: AX=DE02h
--------Q-2FDE10-----------------------------
INT 2F C - DESQview v2.50+ External Dev Interface - FREE TASK
	AX = DE10h
	BX = mapping context of process (see #00416 at INT 15/AX=1016h)
	DX = task handle of process
Note:	DESQview 2.50+ calls this function before it frees the task; it is
	  similar to AX=DE07h but allows the XDI handler to make calls which
	  cause context switches
SeeAlso: AX=DE06h,AX=DE07h
--------c-2FDF00-----------------------------
INT 2F - HyperWare programs - INSTALLATION CHECK
	AX = DF00h
	BX = product code (see #03105)
	CX = 0000h
	DX = 0000h
Return: AL = status
	    00h not installed
	    FFh multiplex number in use
		CX = 5948h ('YH') if selected product installed
		---HyperDisk---
		BX = code segment of resident portion
		DX = HyperDisk local data version
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range:	AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: INT 13/AX=8EEDh
Index:	installation check;HyperDisk|installation check;HyperStb
Index:	installation check;HyperKey|installation check;HyperScreen
Index:	HyperDisk;installation check|HyperStb;installation check
Index:	HyperKey;installation check|HyperScreen;installation check

(Table 03105)
Values for HyperWare product code:
 4248h	('BH') HyperStb
 4448h	('DH') HyperDisk v4.20+
 4B48h	('KH') HyperKey
 5348h	('SH') HyperScreen
--------Q-2FDF00BX5445-----------------------
INT 2F U - Quarterdeck TELTSR.COM - INSTALLATION CHECK
	AX = DF00h
	BX = 5445h ('TE')
	CX = 4C54h ('LT')
	DX = 5352h ('SR')
Return: BX = 5454h ('TT') if installed
	CX = 494Eh ('IN') if installed
	DX = 5454h ('ST') if installed
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
	  which provides an INT 14h interface to the network
Range:	AH=DEh to AH=FFh and AH=C0h to AH=DDh, selected by scanning
SeeAlso: AX=DF01h"TELTSR",AX=DF02h"TELTSR",INT 14/AH=56h
--------N-2FDF01BX0000-----------------------
INT 2F U - MSG.COM - INSTALLATION CHECK
	AX = DF01h
	BX = 0000h
Return: AX = FDFFh if installed
	   BX = segment of resident code
Program: MSG.COM is a TSR for intercepting incoming Novell broadcast
	  messages written by Gary Dobbins (Dobbins@Arizona.Edu)
--------c-2FDF01BX4448-----------------------
INT 2F - HyperDisk v4.50+ - GET CURRENT CACHE STATE
	AX = DF01h
	BX = 4448h ('DH')
Return: AX = 0000h if function supported
	    BX = number of cache buffers in use
	    CX = number of cache buffers which have been modified
	    DL = caching flags (see #03106)
Range:	AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF02h

Bitfields for HyperDisk caching flags:
Bit(s)	Description	(Table 03106)
 0	staged writes enabled for floppy disks
 1	staged writes enabled for hard disks
 2	writes verified on floppy disks
 3	writes verified on hard disks
 4	reserved (0)
 5	reserved (0)
 6	floppy caching enabled
 7	all caching functions enabled
--------Q-2FDF01-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - CLOSE CONNECTION
	AX = DF01h
Return: nothing???
Note:	invokes the DESQview/X socket API (see INT 15/AX=DE2Eh) function 0006h
	  to close the socket corresponding to the file handle set with
	  AX=DF02h; NOP if no file handle was ever set
SeeAlso: AX=DF00h"TELTSR",AX=DF02h"TELTSR"
--------c-2FDF02BX4448-----------------------
INT 2F - HyperDisk v4.50+ - SET CACHE STATE
	AX = DF02h
	BX = 4448h ('DH')
	DL = new caching flags (see #03106)
Return: AX = 0000h if supported
	    BX = number of cache buffers in use
	    CX = number of cache buffers which have been modified
	    DL = previous caching flags (see #03106)
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range:	AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh
SeeAlso: AX=DF00h,AX=DF01h
--------Q-2FDF02-----------------------------
INT 2F U - Quarterdeck TELTSR.COM - OPEN CONNECTION
	AX = DF02h
	BX = file handle for connection's socket
Return: AX = status
	    0000h successful
	    FFFFh no more room in TELTSR's JFT
Program: TELTSR is a Telnet TSR included with Quarterdeck's DESQview/X v2.00
Notes:	the indicated file handle becomes owned by TELTSR, and is closed in
	  the caller's JFT
	multiple calls to this function will override the previous assignment
	  without closing the previous file; use AX=DF01h before further calls
SeeAlso: AX=DF00h"TELTSR",AX=DF01h"TELTSR"
--------U-2FE000-----------------------------
INT 2F - SETDRVER.COM v2.10+ - INSTALLATION CHECK
	AX = E000h
Return: AX = 4A52h ("JR") if present
Program: SETDRVER is a public domain TSR by Jacob Rieper which sets the
	  apparent DOS version analogously to MS-DOS SETVER
Notes:	this installation check differs from the usual one of returning AL=FFh
	the SETDRVER API is fully emulated by Matthias Paul's FREEVER
SeeAlso: AX=E000h/DX=4D50h,AX=E001h,INT 21/AH=52h
--------j-2FE000-----------------------------
INT 2F - KAOSHIDE - INSTALLATION CHECK
	AX = E000h
Return: AL = FFh if installed
Program: KAOSHIDE ('Hidden Kaos') is a PD joke TSR which randomly capitalizes
	  alphabetic keys, written by Philip Maland. Although not a virus,
	  v2.0 uses some viral-like techniques to hide itself from
	  memory-reports by reducing DOS memory size.
--------U-2FE000DX4D50-----------------------
INT 2F - FREEVER v1.0+ - INSTALLATION CHECK
	AX = E000h
	DX = 4D50h ('MP')
Return: AL = FFh if installed
	    AH = AMIS INT 2Dh multiplex ID
	    CX = FREEVER version (CH=major, CL=minor)
	    DX:DI -> AMIS-compliant signature (see #02569)
		(vendor ID is "M. Paul ", program name is "FREEVER ")
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
	  to SETVER for any DOS-compatible OS, written by Matthias Paul
Note:	FREEVER emulates INT 21/AH=30h, INT 21/AX=3306h, INT 21/AX=4412h,
	  INT 21/AX=4452h, and SETDRVER's API on INT 2F/AX=E00xh, as well as
	  providing an AMIS API on INT 2Dh
SeeAlso: AX=E000h"SETDRVER",INT 21/AH=30h,INT 21/AX=3306h,INT 21/AX=4452h
--------K-2FE000DX5354-----------------------
INT 2F - StuffIt v3.21+ - INSTALLATION CHECK
	AX = E000h
	DX = 5354h ("ST")
Return: AL = FFh if installed
	    BX = version (BH = major, BL = BCD minor)
	    DX = segment of resident code
Program: StuffIt is a freeware delayed keyboard stuffer by Terje Mathisen
--------U-2FE001-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET SETDRVER VERSION
	AX = E001h
Return: AH = major version
	AL = minor version
Note:	the SETDRVER API is fully emulated by Matthias Paul's FREEVER, which
	  returns version 2.10 for this call; use AX=E000h/DX=45D0h to get
	  FREEVER's version number
SeeAlso: AX=E000h,AX=E000h/DX=45D0h
--------U-2FE002-----------------------------
INT 2F - SETDRVER.COM v2.10+ - GET ORIGINAL DOS VERSION INFO
	AX = E002h
Return: AL = FFh if successful
	    BH = major DOS version