INT 10 U - VIDEO - DESQview 2.0x only - internal - GET ???                      
	AH = 81h
	DX = 4456h ('DV')
Return: ES = segment of DESQview data structure for video buffer
	    BYTE ES:[0] = current window number in DV 2.0x
Note:	this function is probably meant for internal use only, due to the magic
	  value required in DX
SeeAlso: AH=82h"DESQview"