VMS Help MESSAGE, MESSAGE Qualifiers  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    MESSAGE command qualifiers let you specify the type and contents
    of output files produced. In addition, MESSAGE command qualifiers
    let you create nonexecutable message files that contain pointers
    to files that contain message data. Output files produced by
    command qualifiers are named according to the rules described in
    the OpenVMS DCL Dictionary.