RPGLE - Write message subfile API

    RPGLE  - Write message subfile API

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      *    $SndMsg - Send a message to the message subfile
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     C     $SndMsg       begsr
      *
     C                   call      'QMHSNDPM'
     C                   parm                    MSGID
     C                   parm                    MSGF
     C                   parm                    MSGDTA
     C                   parm                    DTALEN
     C                   parm                    MSGTYP
     C                   parm                    PGMQ
     C                   parm                    STKCNT
     C                   parm                    MSGKEY
     C                   parm                    ERRCOD
      *
     C                   endsr