But it is PrimeSense's 3D interactive system that has generated the most excitement, especially after an April press conference in Tel Aviv, where top Microsoft honchos announced that the motion technology built into the final Natal product was being produced by PrimeSense. XBox users will be able to place themselves literally 'in the game,' by attaching a box made by PrimeSense to their systems.

When a user walks into the range of the PrimeSense 3D sensor, anything he or she does 'live' will be reflected in the actions of the avatars, the action figures that play the game on-screen. If you're playing tennis, for example, you just move your arm in a racket-swinging motion when you see the ball coming at your avatar - and your avatar's arm moves, swinging the on-screen racket and, hopefully, hitting the ball back at your opponent. Your avatar does whatever you do.