Library /sys$common/syshlp/sysmanhelp.hlb CONFIGURATION, SET, CLUSTER_AUTHORIZATION, Qualifiers, /PASSWORD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PASSWORD=password

    Specifies a password for cluster access. A password consists of
    1 to 31 characters, including alphanumeric characters, dollar
    signs, and underscores. A password provides a second level of
    validation to ensure the integrity of individual clusters on the
    same Ethernet that accidentally use identical group numbers. A
    password also prevents an intruder who discovers the group number
    from joining the cluster.