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

       /CLI=filename

    Specifies a different command language interpreter (CLI) with
    which to process the job. The filename parameter specifies that
    the CLI be SYS$SYSTEM:filename.EXE. The default CLI is that
    defined in the user authorization file (UAF).