Function 80h	DESQview - Set (something) 
entry   AH      80h  
	DX      4456h ('DV') 
	ES:DI   pointer to FAR subroutine to be called on? 
return  DS      segment of DESQview data structure for video buffer 
note 1) This function is probably meant for internal use only, due to the magic 
	value required in DX 
     2) The subroutine seems to be called when the DESQview menu is accessed 
	on entry, AL = 03h or 04h