Hutterer: Observations on trackpoint input data

Peter Hutterer writesabout the behavior of trackpoint devices in great detail."Trackpoints have built-in calibration procedures to find and settheir own center-point. Without that you'll get the trackpoint eventuallybeing ever so slightly off center over time, causing a mouse pointer thatjust wanders off the screen, possibly into the woods, without theobligatory red cape and basket full of whatever grandma eats when she'ssick."