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

       /CLI=filename

    Specifies the name of a command language interpreter (CLI) to
    use in processing the batch job. The file name specifies that
    the CLI be SYS$SYSTEM:filename.EXE. If you do not specify the
    /CLI qualifier, the job is run by the CLI specified in the user
    authorization file (UAF), or whatever CLI was specified when the
    job was originally submitted to the queue.