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2F4000

Category: MS Windows

INT 2F - Windows 3+ (OS/2 2.x???) - GET VIRTUAL DEVICE DRIVER (VDD) CAPABILTIES

	AX = 4000h
Return: AL = video virtualization (see #02746)
Notes:	This function is used by display drivers to find out what capabilities
	  exist for the VDD driver and also trigger the VDD driver to call
	  functions 4005h and 4006h (and 4001h/4002h under OS/2?).  This
	  function also gives the Video Driver hardware access to the video
	  registers.
	Once the background/foreground callouts have been activated by a
	  call to this function, the application *must* handle those callouts
	  and save/restore the video memory itself.


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