Library /sys$common/syshlp/tcpip$ucp_help.hlb MOUNT, Qualifiers, /UID  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /UID=n

    Optional. Default: -2.

    Default UID if no UID mapping exists for file access.

    Restriction: Requires OPER privilege.

    Both the NFS server and NFS client use the proxy database for
    access control. Compaq strongly recommends that you provide a
    proxy with a unique UID for every NFS client user.

    If you need to provide universal access to world-readable files,
    you can use the default UID to avoid creating a proxy for
    every NFS client user. You should avoid using the default UID
    if clients require additional file access; otherwise, client
    users may see unpredictable and confusing results when they
    try to create files. See the Compaq TCP/IP Services for OpenVMS
    Management manual for a detailed discussion about using proxies,
    the default user, and security considerations.