end a user a file directly.  This generally
        doesn't work on any client, and this method is included only for
        backwards compatibility and completeness.

        @param user: C{str} representing the user
        @param file: an open file (unknown, since this is not implemented)
        zŠXXX!!! Help!  I need to bind a socket, have it listen, and tell me its address.  (and stop accepting once we've made a single connection.)Nr‰