Exhibit A JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing of a Statement on Schedule 13G (including any and all amendments thereto)...

                                                                      Exhibit A


                             JOINT FILING AGREEMENT


         In accordance with Rule 13d-1(k)(1) promulgated under the Securities
Exchange Act of 1934, as amended, the undersigned agree to the joint filing of a
Statement on Schedule 13G (including any and all amendments thereto) with
respect to the shares of Xxxxx.xxx, Inc. and further agree to the filing of this
agreement as an Exhibit thereto. In addition, each party to this Agreement
expressly authorizes each other party to this Agreement to file on its behalf
any and all amendments to such Statement on Schedule 13G.


Dated:  February 7, 2003                    SBC COMMUNICATIONS INC.



                                            By: Xxxxxxx X. Xxxxxxxxxx
                                                Xxxxxxx X. Xxxxxxxxxx
                                                Senior Executive Vice President
                                                and Chief Financial Officer


Dated:  February 7, 2003                    AMERITECH CORPORATION



                                            By: Xxxxxxx X. Xxxxxxxxxx
                                                Xxxxxxx X. Xxxxxxxxxx
                                                Executive Vice President
                                                and Chief Financial Officer


Dated:  February 7, 2003                SBC VENTURE HOLDINGS, LLC
                                            By SBC Investment Portfolio, LLC
                                            Manager of SBC Venture Holdings, LLC


                                            By: Xxxxxxx X. Xxxxx
                                                Xxxxxxx X. Xxxxx
                                                President and Treasurer
                                                SBC Investment Portfolio, LLC