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

       /MOP client-name

    Connects your system to a remote system using the MOP protocol.
    Note that this qualifier is displayed only if DECnet-Plus is
    installed on your system.

    For more information, type the following command:

    $ HELP DECnet-Plus DCL_Commands SET HOST/MOP