INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION
        AX = FF96h
        CX = what to set
            0000h ???
            0001h print-on-hotkey state
            0002h print-on-exit state
            0003h print job timeout in clock ticks
            0004h print-on-EOF state
        BX = new value (0000h disabled, 0001h enabled except for timeout)
Return: AX = ???
Note:   PREDIR.EXE is the network printer redirector included as part of the
          PC/TCP system by FTP Software, Inc.