Its iDrive user interface consists of an LCD panel mounted in the dashboard and a controller knob mounted on the center console, and it controls a vast and disparate number of functions in BMWs.
The controller looked like a window-mounted air conditioner and could be programmed to run machines in different sequences without rewiring all those cabinets, a huge time-saver.
Two-dimensional tracking would be managed via the existing Move's visual spectrum camera, or by using a display-mounted IR emitter in conjunction with a remote mounted sensor (again, just like the Wii controller).