A system and method for emulating a mouse input device with a touchpad input device having a drag switch and touch device in which the direction of movement of the touch device across the touchpad surface is determined, a display cursor is caused to move in the same relative direction as the direction...http://www.google.de/patents/US5327161?utm_source=gb-gplus-sharePatent US5327161 - System and method for emulating a mouse input device with a touchpad input device
