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Concept
IChat
Summary
iChat (previously iChat AV) is a discontinued instant messaging software application developed by Apple Inc. for use on its Mac OS X operating system. It supported instant text messaging over XMPP/Jingle or OSCAR (AIM) protocol, audio and video calling, and screen-sharing capabilities. It also allowed for local network discussion with users discovered through Bonjour protocols.
In OS X 10.8 Mountain Lion, iChat was replaced by Messages for chat and FaceTime for video calling.
iChat was first released in August 2002 as part of Mac OS X 10.2. It featured integration with the Address Book and Mail applications and was the first officially supported AIM client that was native to Mac OS X (the first-party AIM application at the time was still running in Classic emulation).
One episode of the first season of the HBO dramedy series Entourage had Eric Murphy having an iChat conversation with Ari Gold, marking the first time that this application was used on a television series.
iChat incorporated Apple's Aqua interface and used speech bubbles and pictures to personify the online chatting experience. With iChat, green (available), yellow (idle), and red (away) icons could be displayed next to the name of each connected user on the buddy list. For color-blind users, this could be altered to show different shapes, circle (available), triangle (idle), and squares (away), to illustrate status with shape rather than color.
In June 2003, Apple announced iChat AV, the second major version of iChat. It added video and audio conferencing capabilities based on the industry-standard Session Initiation Protocol (SIP). The final version of the software was shipped with Mac OS X 10.3 and became available separately on the same day for Mac OS X 10.2.
In February 2004, AOL introduced AOL Instant Messenger (AIM) version 5.5 for Windows users, which enabled video, but not audio, chats over the AIM protocol and was compatible with Apple's iChat AV. On the same day, Apple released a public beta of iChat AV 2.1 to allow Mac OS X users to video conferencing with AIM 5.
Official source
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