INT 15 - TopViewTopView, DESQview, TaskView, OmniView, other compatibles - "LOCATE" - FIND WINDOW ATIBM PC AT A GIVEN SCREEN LOCATION
	AX = 1018h
	BH = column
	BL = row
	ES = segment of object handle for window below which to search
	    0000h = start search with topmost window
Return: ES = segment of object handle for window which is visible at the
	       indicated position, or covered by indicated window
	    0000h if no window
SeeAlso: AX=1023h,AX=1024h