That's correct, two people can't be doing 2 different things at the same time (i.e., there is one keyboard). However you do have 2 mouse pointers and you can move/point/click with them independently. We found that in practice we actually preferred this because it's valuable to know that everyone is looking at the same thing at the same time.
yeah, that's why I say it just looks juicy because when using teamviewer or another screen sharing, we still talk discuss. Then knowing each other mouse is not necessary anymore :)