pixelsense

I want to be able to pair Microsoft PixelSense hardware with multiple mobile devices via bluetooth and I want PixelSense to know which device is which. So if I place two phones on a table, PixelSense should be able to label them by device name. My initial thought was to have the phone display an Identity Tag that has encoded its Bluetooth MAC address so that it could associate them but PixelSense sees in infrared and can't read the phone screen so that idea is out. Can anyone think of another way to do this? Microsoft has demonstrated a way to do this in their Mobile Connect sample application

Recently I was doing a lot of development in Microsoft Surface application's. I also read something about how these applications can be tested. Currently I'm using Unit tests (package Microsoft.VisualStudio.TestTools.UnitTesting) to test the low level functionality of single methods. The user interface I'm testing with the Surface Simulator API. For both approaches I always create a extra project in the same solution. But I'm not really sure if this is really a good approach. Unit testing is more or less ok, but the tests for the user interface are more or less limited by clicking various