The present invention is a system that provides a pen based computer user with a graphical user interface tool, a pen-mouse, that looks like and functions like a mouse but that is controlled by a limited input device such as a pen or stylus of the pen based computer. The pen-mouse is a tracking menu...http://www.google.com.hk/patents/US7242387?utm_source=gb-gplus-share專利 US7242387 - Pen-mouse system
