VMS Help LANCP, SET, DEVICE parameters, Qualifiers, /CONTENDER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /CONTENDER
       /NOCONTENDER (default)

    Specifies that the Token Ring device is to participate in
    the Monitor Contention process when it joins the ring. The
    /NOCONTENDER qualifier, directs the device not to challenge the
    current ring server.