EXHIBIT A Joint Filing Agreement The undersigned hereby agree that the Statement on Schedule 13D filed herewith (and any amendments thereto), relating to the common stock, par value $0.01 per share, of Video Network Communications, Inc., is being...

                                                                  EXHIBIT A


                           Joint Filing Agreement

         The undersigned hereby agree that the Statement on Schedule 13D
filed herewith (and any amendments thereto), relating to the common stock,
par value $0.01 per share, of Video Network Communications, Inc., is being
filed jointly with the Securities and Exchange Commission pursuant to Rule
13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, on
behalf of each such person.


May 28, 2002

                                            BANK ONE CORPORATION


                                            By:  /s/ Xxxxxxx X. Xxxxxxxx
                                                 ----------------------------
                                                 Name:  Xxxxxxx X. Xxxxxxxx
                                                 Title: Treasurer


                                            BANC ONE FINANCIAL CORPORATION


                                            By:  /s/ Xxxxxxx X. Xxxxxxxx
                                                 -----------------------------
                                                 Name:  Xxxxxxx X. Xxxxxxxx
                                                 Title: Treasurer


                                            BANC ONE CAPITAL CORPORATION


                                            By:  /s/ Xxxxxxx X. Xxxxxx
                                                 ------------------------
                                                 Name:  Xxxxxxx X. Xxxxxx
                                                 Title: Managing Director


                                            BANK ONE INVESTMENT CORPORATION


                                            By: /s/ Xxxxxx X. Selmonosky
                                                ----------------------------
                                                Name:  Xxxxxx X. Selmonosky
                                                Title: Managing Director


                                            MONEYLINE TELERATE HOLDINGS


                                            By:  /s/ Xxxxxxxxx Xxxxx
                                                 ---------------------------
                                                 Name:  Xxxxxxxxx Xxxxx
                                                 Title: Executive Vice
                                                        President, Business
                                                        Development and General
                                                        Counsel


                                            MONEYLINE NETWORKS, LLC


                                            By:  /s/ Xxxxxxxxx Xxxxx
                                                 ---------------------------
                                                 Name:  Xxxxxxxxx Xxxxx
                                                 Title: Executive Vice
                                                        President, Business
                                                        Development and General
                                                        Counsel