From iChat FAQ:
"The first account names you should add are the two test accounts set up by Tony Liu; tryichatav is an AIM account name. It runs on a Mac for Mac to Mac checks.
It is auto responding and plays a view from the camera and palys a radio show as sound. It can be used for Audio checks as well and you will here the sound track only.
tryaimpc is also an AIM account name for trying links to a PC running AIM 5.5 (Last time I checked. It shows the view from the Camera and plays some music in the background).
(NOTE: these two Buddies have been up and running since Febuary 2004. They are not always on-line and are very busy when they are). "