ICQ

ICQ is an instant-messaging program that lets you communicate with friends and colleagues in real time. To seek out a friend on the ICQ network, simply enter his or her ICQ number, name, nickname, or e-mail address. Once your contact list is set up, you'll be notified when your friends are online so that you can chat; send instant messages, files, and URLs; play games; or just hang out.

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ICQ

source :
http://www.oldversion.com