INT 7F - Alloy MW386 - GET/SET USER STATUS
        AH = A5h
        AL = function
            00h get status
                Return: BX = user flags
                            bit 5: allow messages
                        CL = scan code for task manager hotkey
                        CH = scan code for spooler hotkey
                        DL = scan code for task swapper hotkey
                        DH = modifier key status
            01h set status
                BX = user flags (see above)
                CL = scan code for task manager hotkey
                CH = scan code for spooler hotkey
                DL = scan code for task swapper hotkey
                DH = modifier key status
        DI = machine number and user number
Return: CF set if invalid user number
Note:   must have supervisor privilege to set another user's status