(
User
Location
Service server) A conferencing directory server on a TCP/IP network (intranet, Internet, etc.) that is used to identify participating users. When an audio or videoconferencing program is launched, it sends its user profile and current IP address to the ULS server, so that others can query the server and find out who is currently logged on. Microsoft renamed its ULS servers to ILS servers (Internet Locator Server), and Netscape Conference used DLS servers (Dynamic Lookup Service). See
IP telephony.