The "by" prepositional phrase authenticates that an account or
    proxy account for a particular user has been set up with the
    proper access control information. Use of the by preposition
    is portable to other DECnet-Plus systems. Use the following
    format to append access control information using the by
    preposition.

       by user=username, password=password, account=account, -
         proxy={TRUE/FALSE}

    For Tru64 UNIX, NCL ignores any use of the by proxy clause
    so that the modifier "by proxy=true" (i.e., proxy access
    allowed) is always in effect.

    If user j_smith has privileges to access the session control
    application graphics_exchange on the remote node, he can use
    the by preposition as follows:

    ncl> ! On node .admin.finance
    ncl> show node .admin.artists session control application -
    _ncl> graphics_exchange all counters, by user=j_smith, -
    _ncl> password=DoNotUse
          .
          .
          .

    For Tru64 UNIX, access control does not have any effect when the
    NCL command is directed to the local node. This happens because
    NCL uses interprocess communication instead of DECnet-Plus to
    communicate with node 0, the local node, and therefore the user's
    privileges are determined by the user id that NCL is running under.