Indicates whether proxy login requests present on incoming logical
 links are to honored.  There are two options for INCOMING PROXY:

                 DISABLED:      Ignores all incoming proxy requests and
                                instead relies exclusively on access control
                                information supplied in the connect requests
                                to validate the logical link.

                 ENABLED:       Invokes the appropriate proxy, based on
                                the source user, source node, and supplied
                                access control information (if any).