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If you have updated your Nokia Lumia 820 or 920 to Lumia Black but have been disappointed by not being able to install the offered Beamer download, the good news is that the app is now generally available to all 820 and 920 owners on Black.
The app allows Windows Phone owners to share a stream of screen shots taken in the background from your Windows Phone, which may be useful for doing such things as giving a presentation from your phone or showing a photo on a smart TV.
The free app can be found in the Windows Phone Store here.