iChat enables you to conduct live chats or audio or video conferences with .Mac, AIM (AOL Instant Messenger), and Jabber users.
Here’s how it works. The first time you open iChat, you configure it with your .Mac or AIM account information, as well as the information for your buddies who use iChat or AIM. Then, while you’re connected to the Internet with iChat running, iChat does two things:
It tells iChat and AIM users that you’re available to receive instant messages and participate in chats.
It tells you when your buddies are connected via iChat or AIM and available to receive instant messages and participate in chats.
When a buddy is available, sending him an instant message is as easy as clicking a button and typing what you want to ...