ICQ ("I Seek You") is a program you can download that will let you know when friends and contacts are also online on the Internet. ICQ allows you to page them, chat with them, and initiate and participate in PC-to-PC calls, PC-to-phone and phone-to-phone calling cards calls. Like AOL's Instant Messenger (AIM), in order to use ICQ, both parties must have downloaded the program.
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The free download and registration procedures are user friendly. ICQ enables you to send messages, files (single, multiple or whole directories), and URLs directly to your friends. In addition, you can initiate an IRC-style chat session or voice and video-voice connection and play games with other ICQ members that you are in touch with. Your contact is signalled of an incoming event in real time and has immediate access to it.