This article makes you know how to set up mutiperson chat on iChat.
Set up multiperson chat on iChat, you can chat with lots of people in one multiperson text chat, audio chat, and video chat.
However, you can connect to lots of people in one multiperson text chat, up to 10 total people in a multiperson audio chat, and up to four total people in a multiperson video chat, as long as your system supports it . Here's how to set up a mutiperson chat.
Set up mutiperson chat
Select the buddies that you want to participate in your multiperson chat (hold down the Command key to select more than one buddy).
Click the "A" button at the bottom of the buddy list window to start a text chat, the phone button to start an audio chat, or the movie camera button to start a video chat.
As your participants accept your invitation, they will be able to send text, talk, or visually interact with everyone who joins.
Anyone can leave the chat at anytime by closing the chat window. The chat will continue as long as the person who initiated the multiperson chat keeps his or her chat window open.
A good and easy-to-use instant messaging application allows people to chat with other online users near or far by audio, video and screen-sharing capabilities as well as text messaging."