How to play co-op with mutual streaming?

Question

Is it somehow possible to play a co-op game with a small overlay window showing someone else's screen while streaming the own screen content to them?

How can it be achieved, preferably with freeware?

Answer

Have you tried simply using justin.tv or livestream and a built-in system like the steam or origin web browsers as overlays? If you only need to view the other person's screen when stuck on a puzzle or something (a portal-like game, I suppose) this should be an easy to set up solution (though as was already mentioned, Portal 2 already has this functionality built in).

I know you would prefer a free solution, but I'll also take this opportunity to plug a dual-monitor computer setup. Monitors can be had for around $100 if you wait for a deal. Used CRT monitors can be had for cheap or free if you ask around. You will never believe how much more productive you can be with dual monitors until you actually try it out.

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