The invention is embodied in a wireless stylus that incorporates, for example, an infrared emitter for communicating with a receiver associated with a computer. The stylus is provided with push-buttons near its tip that can be actuated by the user during the course of pointing the stylus at a touch screen...http://www.google.de/patents/US6529189?utm_source=gb-gplus-sharePatent US6529189 - Touch screen stylus with IR-coupled selection buttons
