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

    Requires the SECURITY privilege.

    Changes the system password rather than a user password.

    If a terminal line has the system password (SYSPWD)
    characteristic set, no terminal prompts are sent to that terminal
    until the system password is entered.

    A system password is valid only for the node it is set on. In an
    OpenVMS Cluster, each node can have a different system password.

    The /SYSTEM and /SECONDARY qualifiers are incompatible. For
    more information about the use of system passwords, refer to
    the OpenVMS Guide to System Security.