Library /sys$common/syshlp/uafhelp.hlb ADD, /PROXY, Positional Qualifier, /DEFAULT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Establishes the specified user name as the default proxy account.
    The remote user can request proxy access to an authorized account
    other than the default proxy account by specifying the name of
    the proxy account in the access control string of the network
    operation.