A1h 20 BYTEs	FAX number
 B5h 20 BYTEs	remote FAX ID
 C9h	WORD	error code
 CBh	WORD	connection direction (00h transmit, 01h receive)
 CDh	BYTE	connection time minutes
 CEh	BYTE	connection time seconds
 CFh	BYTE	???
 D0h	WORD	connection speed (24, 48, 72, 96, 12, 144)
 D2h	WORD	connection page size (A4, B4, A3)
 D4h	WORD	connection coding scheme (1-DN, 1-DH, 2-DN, 2-DH)
 D6h	WORD	page count
--------F-2FDB17-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - BEGIN RECEIVING INCOMING CALL
	AX = DB17h
Return: AX = status (0000h successful, 0001h unable to start at this time)
SeeAlso: AX=DB00h"ZFAX"
--------F-2FDB18-----------------------------
INT 2F - ZyXEL ZFAX v4.01 - SCHEDULE CALL
	AX = DB18h
	DS:SI -> schedule data (see #03097)
Return: AX = status (see #03096)
SeeAlso: AX=DB00h"ZFAX"
--------F-2FDB20-----------------------------
INT 2F - ZyXEL ZFAX v3+ - POLL FAX
	AX = DB20h
	DS:SI -> remote FAX number
Return: AX = status (see #03096)
SeeAlso: AX=DB11h,AX=DB21h
--------F-2FDB21-----------------------------
INT 2F - ZyXEL ZFAX v3+ - SEND VOICE
	AX = DB21h
	DS:SI -> filename including path (max 128 characters)
	DS:BX -> remote phone number
Return: AX = status (see #03096)
SeeAlso: AX=DB11h,AX=DB20h,AX=DB22h,AX=DB23h,AX=DB24h
--------F-2FDB22-----------------------------
INT 2F - ZyXEL ZFAX v3+ - CONVERT VOICE FILE
	AX = DB22h
	DS:SI -> source filename, including path (max 128 characters)
	DS:BX -> destination filename, including path (max 80 characters)
	CX = destination format
	    00h two-bit ADPCM, 01h three-bit ADPCM, 02h VOC
Return: AX = status (see #03096)
SeeAlso: AX=DB13h,AX=DB20h,AX=DB21h,AX=DB23h
--------F-2FDB23-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECORD VOICE FILE
	AX = DB23h
	DS:SI -> destination filename, including path (max 128 characters)
	CX = recording channel (0 = telephone line, 1 = microphone/speaker)
	DX = voice file format
	    00h CELP, 01h two-bit ADPCM, 02h three-bit ADPCM
Return: AX = status (see #03096)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB24h
--------F-2FDB24-----------------------------
INT 2F - ZyXEL ZFAX v3+ - PLAY VOICE FILE
	AX = DB24h
	DS:SI -> name of voice file, including path (max 128 characters)
	CX = playback channel (0 = telephone line, 1 = microphone/speaker)
Return: AX = status (see #03096)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB24h
--------F-2FDB25-----------------------------
INT 2F - ZyXEL ZFAX v3+ - ANSWER MODEM WITH VOICE SYSTEM
	AX = DB25h
Return: AX = status (see #03096)
SeeAlso: AX=DB21h,AX=DB22h,AX=DB26h,AX=DB27h,AX=DB28h
--------F-2FDB26-----------------------------
INT 2F - ZyXEL ZFAX v3+ - DIAL PHONE
	AX = DB26h
	DS:SI -> remote phone number
Return: AX = status (see #03096)
SeeAlso: AX=DB25h
--------F-2FDB27-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECEIVE FAX - ANSWER MODEM AND SET TO FAX MODE
	AX = DB27h
Return: AX = status (see #03096)
SeeAlso: AX=DB25h,AX=DB28h
--------F-2FDB28-----------------------------
INT 2F - ZyXEL ZFAX v3+ - RECEIVE FAX DATA - ANSWER MODEM IN MULTI-AUDIO MODE
	AX = DB28h
Return: AX = status (see #03096)
SeeAlso: AX=DB25h,AX=DB27h,AX=DB41h
--------F-2FDB40-----------------------------
INT 2F - ZyXEL ZFAX v3+ - INTERNAL TERMINAL
	AX = DB40h
Return: AX = status (see #03096)
SeeAlso: AX=DB00h
--------F-2FDB41-----------------------------
INT 2F - ZyXEL ZFAX v3+ - SEND DATA - DIAL NUMBER AND UPLOAD FILE WITH ZMODEM
	AX = DB41h
	DS:SI -> source file name, including path (max 128 characters)
	DS:BX -> remote data number
Return: AX = status (see #03096)
SeeAlso: AX=DB00h,AX=DB28h
--------K-2FDC00-----------------------------
INT 2F - GOLD.COM - INSTALLATION CHECK
	AX = DC00h
Return: AL = state
	    00h not installed
	    FFh installed
Program: 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
--------K-2FDC01-----------------------------
INT 2F - GOLD.COM - GET STATE
	AX = DC01h
Return: AL = status
	    00h off
	    01h on
SeeAlso: AX=DC00h,AX=DC02h
--------K-2FDC02-----------------------------
INT 2F - GOLD.COM - SET STATE
	AX = DC02h
	DL = new state
	    00h off
	    01h on
Return: AL = 00h (OK)
SeeAlso: AX=DC01h
--------t-2FDD-------------------------------
INT 2F - CappaCom programs - API
	AH = DDh
	AL = 00h general installation check
	    Return: AL = FFh if any CappaCom programs are resident
	AL = FEh get info
	    Return: ES:BX -> TSR info list (see #03098)
	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
Note:	CappaCom was originally SoftCom but changed its name due to a trademark
	  conflict
Index:	installation check;SoftCom programs
Index:	installation check;CappaCom programs

Format of CappaCom TSR info list:
Offset	Size	Description	(Table 03098)
 00h  9 BYTEs	blank-padded ASCIZ program name
 09h	BYTE	program ID
 0Ah	WORD	program's PSP segment
 0Ch	WORD	program version (major in high byte)
 0Eh	DWORD	pointer to next item in info list or 0000h:0000h
 12h	BYTE	number of interrupts hooked
 13h  5 BYTEs	interrupt numbers hooked by program
 18h  8 BYTEs	reserved
----------2FDD-------------------------------
INT 2F - MIXFIX.EXE - API
	AH = DDh
	AL = function
	    00h installation check
		Return: AX = 00DDh if installed
			    BX = version (BH = major, BL = minor)
	    41h/61h get From: address
		Return: AX = 0001h
			ES:BX -> ASCIZ 4d address of mail sender ("1:2/3.4")
	    49h/69h get To: address
		Return: AX = 0001h
			ES:BX -> ASCIZ 4d address of recipient ("1:2/3.4")
	    4Ah/6Ah get subject of mail
		Return: AX = 0001h
			ES:BX -> ASCIZ subject of handled mail
	    4Dh/6Dh get mail name
		Return: AX = 0001h
			ES:BX -> ASCIZ full name of current mail file
	    4Eh/6Eh get From: field
		Return: AX = 0001h
			ES:BX -> ASCIZ From: field of mail (mail sender's name)
Program: MIXFIX by "KIV without Co" is a FidoNet mail robot which may execute
	  other programs for mail handling.  The called programs may use the
	  services described here to retrieve information about the mail being
	  handled.
Index: installation check;MIXFIX.EXE
--------d-2FDD--BX7844-----------------------
INT 2F - xDISK v3.32+ - INSTALLATION CHECK
	AH = DDh
	BX = 7844h ('xD')
	CX = 4953h ('IS')
	DX = 4B3Fh ('K?')
	AL = desired drive (01h-1Ah) or 00h to check for xDISK on any drive
	ES:DI -> 25-byte data buffer (see #03099)
Return: AX = DDFFh if installed (on specified drive if AL nonzero on entry)
	   BX = 87BBh
	   DX = B4C0h
	   ES:DI buffer filled
	CX,CF destroyed
SeeAlso: INT 21/AX=4404h"xDISK",INT 21/AX=4405h"xDISK"

Format of xDISK data buffer:
Offset	Size	Description	(Table 03099)
 00h	DWORD	pointer to ASCIZ driver signature "xDISK unit: X"
 04h	BYTE	flag: 01h if disk linked to DOS, 00h if unlinked
 05h	BYTE	flag: 01h if write protected, 00h if not
 06h	BYTE	flag: 01h if root directory full, 00h if not
 07h	BYTE	flag: 01h if free space uncompacted, 00h if compacted
 08h	BYTE	resizing state: 00h not resizable, 01h resized, 80h resizable
 09h	BYTE	flag: 01h inelastic resizable disk, 00h elastic
 0Ah  2 BYTEs	reserved
 0Ch	BYTE	flag: 01h collapsed disk, 00h not collapsed
 0Dh	BYTE	flag: 01h using all EMS, 00h some EMS free
 0Eh	BYTE	flag: 01h password enabled, 00h disabled
 0Fh	BYTE	flag: 01h password audio feedback, 00h no feedback
 10h	BYTE	flag: 01h password video feedback, 00h no feedback
 11h	BYTE	flag: 01h confirm changes, 00h no confirmation
 12h	BYTE	flag: 01h terse display, 00h verbose display
 13h	BYTE	flag: 01h click speaker on disk access, 00h no click
 14h	BYTE	flag: 01h flash icon on disk access, 00h no icon flash
 15h	BYTE	FAT entry size: 00h 12-bit, FFh 16-bit
 16h	WORD	count of open files in RAM disk
 18h	BYTE	unused
--------N-2FDE00BL00-------------------------
INT 2F U - Novell Netware - RPRINTER, NPRINTER - INSTALLATION CHECK
	AX = DE00h
	BL = 00h
Return: AL = FFh If Rprinter/Nprinter Installed
	BX -> Program Segment Prefix N/Rprinter.exe
--------Q-2FDE00BX4456-----------------------
INT 2F - DESQview v2.26+ External Device Interface - INSTALLATION CHECK
	AX = DE00h
	BX = 4456h ("DV")
	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")
Range:	AH=C0h to AH=FFh, selected by scanning AH=DEh-FFh, then AH=C0h-DDh
Note:	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
SeeAlso: AX=DE02h,INT 15/AX=5400h
--------Q-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
--------Q-2FDE01BX4450-----------------------
INT 2F U - Quarterdeck QDPMI.SYS v1.0 - INSTALLATION CHECK
	AX = DE01h
	BX = 4450h ("DP")
	CX = 4D49h ("MI")
	DX = 3039h ("09")
Return: AL = FFh if installed
	    BX = 4D42h ("MB")
	    CX = 4921h ("I!")
	    DX = 8F4Fh
	    ES:DI -> filename of DPMI host overlay
InstallCheck:	test for the existence of the character device QDPMI$$$
SeeAlso: INT 2F/AX=1687h,INT 31/AX=0000h
Index:	installation check;QDPMI
--------U-2FDE01BX5242-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, Ralf Brown's XDI drivers
	AX = DE01h
	BX = 5242h ("RB")
	CX:DX = program identifier
		656F7000h ("eop",0) for DVeop
Return: AX = 5242h ("RB") if installed
	    ES:BX -> data or entry point (see #03100)
	    CX = version number (CH = major, CL = minor)

(Table 03100)
Call DVeop entry point with:
	ES:DI -> callback address or 0000h:0000h to remove callback
Return: AX = status
	    0000h failed (callback table full or attempted to remove non-
		  existent callback)
	    0001h 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.
--------U-2FDE01BX7474-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVTXDI.COM
	AX = DE01h
	BX = 7474h
	CL = function
	    00h installation check
		Return: AL = FFh
	    01h get process handle
		DX = keys on Open Window menu (DL = first, DH = second)
		Return: AX = process handle or 0000h if not running
	    02h (v1.3+) set TMAN handle
		DX = TMAN process handle
	    03h (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
Index:	installation check;DVTXDI
--------U-2FDE01BX7575-----------------------
INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVSIXDI.COM
	AX = DE01h
	BX = 7575h
	CX = function
	    0000h installation check
		Return: AX = 00FFh if installed
	    0001h turn on notification (currently unused)
		Return: AX = 0001h
	    0002h turn off notification (currently unused)
		Return: AX = 0001h
	    0003h get process information
		Return: AX = status
			    0000h failed
			    0001h 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 #03101,#03102)
	    0004h get version
		Return: AH = major version
			AL = minor version
	    0005h (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+)
	    0006h (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.
Index:	installation check;DVSIXDI

Format of DVSIXDI v1.00 information for one process: