/sys$common/syshlp/helplib.hlb HELP, /MESSAGE, Qualifiers, /DELETE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /DELETE=filename.MSGHLP

    Deletes all messages contained in the specified .MSGHLP file from
    whichever of the following files is found first:

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

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

    You must have write access to Compaq supplied .MSGHLP$DATA files
    to delete messages from the Compaq supplied database.

                                   NOTE

       If you create a .MSGHLP file by specifying a search string,
       check the output .MSGHLP file to be sure the search did
       not pick up any unexpected messages that you do not want to
       delete from the database. Edit any such messages out of the
       .MSGHLP file before you perform the delete operation.