/INSERT=filename.MSGHLP

    Updates the first of the following files to be found with new or changed
    information from the specified .MSGHLP file:

    o  A .MSGHLP$DATA file specified with the /LIBRARY qualifier

    o  The first .MSGHLP$DATA file in a search path specified by the
       /LIBRARY qualifier

    o  The first .MSGHLP$DATA file in the default search path
       (defined by logical name MSGHLP$LIBRARY)

    o  SYS$HELP:MSGHLP$LIBRARY.MSGHLP$DATA (the default MSGHLP$DATA file)

    You must have write access for the OpenVMS supplied .MSGHLP$DATA
    files to insert data into these files. User-supplied data is
    identified by change bars in Help Message output.