INT 16 U - PCIBM PC Tools v5.1-8.0 DESKTOP - GET ???
	AX = FFC4h
Return: AL = ???
	BX = segment of scratch space???
	CX = segment of stored screen data (section covered by window???)
	DX = segment of window parameters for ???
	ES:BP -> ???
Note:	available only when popped up in versions prior to 6.0