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Int 21 Fn A5 - Attachmate Extra - Get Host Window Cursor Position [I]
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
See Also: AH=A4h
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