INT 21 - LANtastic - SET QUEUE ENTRY
        AX = 5FA1h
        BX = handle of opened queue entry
        DS:SI -> queue entry (see AX=5FA0h)
Return: CF clear if successful
        CF set on error
            AX = error code
Notes:  the only queue entry fields which may be changed are output control,
          number of copies, destination device, and comment
        the handle in BX is that from a create or open (INT 21/AH=3Ch,3Dh)
          call on the file "\\server\\@MAIL" or "\\server\@name" (for
          printer queue entries)
SeeAlso: AX=5FA2h,AX=5FA9h