INT 21 - Attachmate Extra! - GET HOST WINDOW CURSOR POSITION                    
	AH = A5h
	AL = window number (1-4=host B-E)
Return: BX = cursor position (80 * row + column, where 0:0 is upper left)
Note:	if the host window is configured with the Extended Attribute (EAB)
	  feature, multiply the cursor position by 2 to obtain the byte offset
	  into the display buffer
SeeAlso: AH=A4h