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Int 17 Fn 91 - Alloy Ntnx, Mw386 - Get User Number And Current Printer [N]
AH = 91h
AL = mode
00h NTNX compatibility
Return: CX = user number (00h = host)
DX = currently selected printer number (00h-08h)
01h MW386
Return: CX = user number
DX = physical dev number of currently selected printer
02h MW386 v2+
BX = logical device number
00h-03h = LPT1-LPT4
04h-07h = COM1-COM4
Return: CX = user number
DX = physical device number
Return: AL = status (see AH=81h)
See Also: AH=8Ch
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