INT 2F - DESQview v2.26+ External Device InterfaceA series of calls made by the DESQview multitasker on various "interesting" events, which may be intercepted by programs which wish to keep track of the current system state.	 See also Callout. - 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 XDIsee External Device Interface handler should not issue any DOS or BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. calls, nor should it
	  issue DESQview API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. calls other than those allowed from hardware ints
SeeAlso: AX=DE02h,INT 15/AX=5400h