You can specify a list of ICQ friends, and an ICQ server will alert you when any of these friends go online. You use your ICQ# to register your presence with the ICQ network when you go online and start ICQ, and to allow other ICQ users to recognize when you are online so that they can contact you. During registration, you are given a unique number called an ICQ#, which identifies you to all other users on the ICQ network. When you install ICQ and begin the registration process, you are connected to an ICQ server that belongs to a network of such servers distributed across the Internet. ICQ can even function as a universal platform for launching any peer-to-peer application, such as Microsoft NetMeeting. You can use ICQ to send real-time messages to other users, have group chat sessions, send e-mail, transfer files and URLs, play games, and so on. ICQ, which homophonically stands for “I seek you,” lets you search for users currently online on ICQ networks and alerts you when friends go online. ICQ is a program that enables users to locate other ICQ users on the Internet and communicate with them in real-time. Definition of ICQ in Network Encyclopedia.

What is icq number mean