The Test Room looks different for an Attendee. The Attendee will see the Attendee List, but in Pane 1 will only see the Co-Host/Host Web Cam and his/her own Web Cam. The Attendee will not see anyone else's Web Cam in the room.
The Attendee will be able to see chat messages that the Host or Co-Host post, but the Group Chat will be locked from the Attendee posting messages. However, the Attendee will have access to the Direct Chat for the Host or Co-Host. Attendees will not be able to Direct Chat with one another.
There is a Raise Hand icon in the bottom left corner of the session for the Attendee to use to get the attention of the Host or Co-Host. They can then Direct Chat with one another or use the Web Cam to communicate.