Int 7F Fn 05 - Alloy Ntnx (host) - Lock/unlock System, Spooler Control [N] AH = 05h AL = function 00h lock system (disable slave services) 01h unlock system 02h enable spooler 03h disable spooler 04h enable slave timer update 05h disable slave timer update 06h enable form feeds 07h disable form feeds See Also: INT 17/AH=A4h