A pointing device, such as a mouse, for a computer system detects when a pointer controlled by the mouse is within a control zone of a display (e.g., and icon). When it is, the speed factor for the mouse is reduced making it easier for the user to hit an icon....http://www.google.de/patents/US5508717?utm_source=gb-gplus-sharePatent US5508717 - Computer pointing device with dynamic sensitivity
