| 摘要 |
A secondary input system for a pen-based computer allows users to control a graphical user interface without the use of a stylus. The secondary input system may me in the form of a pointing system. A display surface may be attached to a housing in which the display surface is sensitive to input of a pen device. The pointing system includes a secondary input system on housing in which the input device is responsive to movement of a finger of a user for controlling the graphical user interface. The input device may be a point stick device, a touchpad, or other device that provides two-dimensional movement of a graphical object on the display surface. The secondary input system may be automatically activated or deactivated based on proximity sensing of a stylus or pen with respect of the display surface.
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