The velocity of the pointer depends on the applied force so increasing pressure causes faster movement. A pointing stick can be used by pushing with the fingers in the general direction the user wants the cursor to move. The pointing stick senses applied force by using two pairs of resistive strain gauges. IBM introduced it commercially in 1992 on its laptops under the name "TrackPoint", patented in 1997. Unlike other pointing devices, it reacts to sustained force or strain rather than to gross movement, so it is called an "isometric" pointing device. Like other pointing devices such as mice, touchpads or trackballs, operating system software translates manipulation of the device into movements of the pointer or cursor on the monitor. IBM ThinkPad caps (left-to-right): Soft Dome, Soft Rim, Classic Dome, Eraser Head (discontinued)Ī pointing stick (or trackpoint, also referred to generically as a nub or nipple) is a small analog stick used as a pointing device typically mounted centrally in a computer keyboard.
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