VMS Help System Services, $SETSHLV, Condition Values Returned  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    SS$_WASCLR         The service completed successfully. Automatic
                       unshelving was previously on.
    SS$_WASSET         The service completed successfully. Automatic
                       unshelving was previously off.
    SS$_ACCVIO         An argument was not accessible by the caller.
    SS$_BADPARAM       The shlvflg argument was invalid.
    SS$_IVLOGNAM       The prcnam argument was invalid. The process
                       name string had either 0 characters or more
                       than 15 characters.
    SS$_NONEXPR        The specified process did not exist, or the
                       specified process identification was invalid.
    SS$_NOPRIV         The caller did not have the privilege to
                       modify other processes.
    SS$_REMOTE_PROC    The specified process was not on the local
                       node. The service cannot modify a process on a
                       remote node.