Print spooling (INT 21h, E0h - Novell NetWare 4.0)

        Entry:
          AH = E0h
          DS:SI ->  Request buffer
          ES:DI ->  Reply buffer
          Subfunction in third byte of request buffer
            00h  Spool data to a capture file
            01h  Close and queue capture file
            02h  Set spool flags
            03h  Spool existing file
            04h  Get spool queue entry
            05h  Remove entry from spool queue
            06h  Get printer status
            09h  Create a disk capture file
        Return:
          AL = error code