UNC Health Care and UNC School of Medicine. We have added an additional feature to the WebXchange directory that allows you to display special instructions on your profile. To add or change special instructions on your WebXchange directory profile, please call the Communications office at 966-2354 or the hospital operator at 966-4131. These instructions are limited to 240 characters including spaces. For an example of how special instructions appear in the web, you may look at my profile.