iChat (or IChatAv) was an Instant Messaging software application developed by Apple Inc. for use on its MacOs X operating system. It supported instant text messaging over XMPP/Jingle or OSCAR (AIM) protocol; it also featured audio, video and Screen Sharing capabilities. It also allowed for local network discussion with users discovered through BonJour protocols. As of February 16, 2012, iChat has been discontinued, and has been replaced in OS X 10.8 "Mountain Lion" by Messages (see IMessage). http://en.wikipedia.org/wiki/IChat
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