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Viewing a part of the screen in a window on Linux

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I plan to make a presentation with a live demo using my wide screen Ubuntu 12.10 Laptop and a projector. My plan is to connect the projector as a second (small) display and put my slides and live-demo there. It would be convenient, if I could see the projector display on my laptop LCD screen within a window (no zoom or stretch needed). So my question is: