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

       /HOST=host

    Optional. Default: Uses the first user name found.

    If the proxy database has multiple entries with the same user
    name and UID combination, the value of /HOST determines the
    specified record.