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TrackPoint
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hardware (Or "pointing stick", "nipple") A small knob found
in the middle of some keyboards that works like a very short
isometric joystick. Pressing it toward or away from you or
from side to side moves the pointer on the screen. Ted
Selker brought the concept of an in-keyboard pointing device
to IBM in September 1987. TrackPoint was introduced in 1992
on the IBM ThinkPad and later on some desktops.
It takes up virtually no extra room on the box or the work
area and also requires minimal movement of the hands from the
keyboard.