The Wiimote's image sensor is used to locate the Sensor Bar's points of light in the Wiimote's field of view.
The Wiimote features an optical sensor, allowing it to determine where the Wiimote is pointing. Since the Sensor Bar is just a source of Infrared Light it doesn't need to be connected to your Computer! Wireless Sensor Bars are usually battery-powered. If you want to play games in Dolphin with a Sensor Bar you can simply use a Wireless Sensor Bar.
