As was pointed out by Exploding_Silver in this post
http://www.tacticalgamer.com/battlef...hru-xfire.html
Xfire has an Alpha feature in their client that's usable, to stream game video which you can access off their profile (or I believe it's actually right-click Show Video on their name).
Provided the instructor has an alright internet connection, this may be very useful in the lecture and demonstration sections of a TGU course. ie: Sniper instruction. You can see through the instructor's scope to understand target training, etc.