| Business | Phone |
| Healthaxis Inc 7301 State Highway 161 300, Irving 75039 | (972) 443-5000 |
| Sterling Commerce Inc 750 W John Carpenter Fwy, Irving 75039 | (469) 524-2000 |
| Mediware Information Systems 4545 Fuller Dr # 320, Irving 75038 | (972) 536-2900 |
| Witness Systems 9901 Valley Ranch Pkwy E, Irving 75063 | (972) 830-9028 |