In G+ hangouts, I'm often sharing my desktop. Sometimes when I do this I mute the other participants because I'm giving some kind of lecture, but I will check back to see what they're saying in chat ...
Does Google+ have any video chat bots you can call to test out the video hangout functionality? [duplicate]
Possible Duplicate: Gmail Video Chat Tester Bot? For instance in Skype I have such as service in my contacts list called "Echo / Sound Test Service" which you can call up, record a message, ...