Int 21 Fn A2 - Attachmate Extra - Set Host Window State [I]
AH = A2h
AL = set status byte
bit 7 : 0=power off, 1=power on
bit 6 : 0=not installed, 1=installed
bits 5-3: reserved
bits 2-0: window number 1-4=host B-E
See Also: AH=A1h
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