Setting Up a Chat with Multiple Buddies

When you want to use iChat to communicate with one buddy, you send an instant message. To communicate with multiple buddies at once, you set up a group chat. A chat window looks just like an instant messaging window, except that you see multiple buddies in the chat window. When you send a message, everyone in the chat sees it. Once invited, buddies can come and go at any time during the chat.

Getting Started with Mac OS X version 10.2 > Using Mail and Instant Messaging > Setting Up a Chat with Multiple Buddies