Bluetooth Application

I have a larger requirement for a bluetooth application but first I have a test for the developer. One Requirement: Make a bluetooth application that can pair automatically with another bluetooth device. This means without user-interaction. This means that when I have the test application running on two devices, they should automatically pair when they are within proximity so they can share a basic piece of information. Use any authentication or shared password technique you think will work. This test should only concentrate on the functionality, don't do any design or UI work except for displaying basic connection and logging information. If you know how to do this it should be simple. If you can do this test, you might be selected for the larger requirement.