A stylus for use in a coordinate input system (e.g. digitizer tablet system) includes a finger wheel. The degree of rotation of the finger wheel by the user determines the extent to which a chosen graphical parameter (e.g. line thickness, color, shading, gray scale, etc.) is varied. Thus, a user can...http://www.google.de/patents/US6259438?utm_source=gb-gplus-sharePatent US6259438 - Coordinate input stylus
