A
trackball is a
pointing device consisting of a
ball housed in a socket containing sensors to detect rotation of the ball about two axes - like an upside-down
mouse. The user rolls the ball with his
thumb or the palm of his
hand to move a cursor. Tracker balls are common on
CAD workstations for ease of use and on modern
portable computers, where there may be no desk space on which to use a mouse. Some clip onto the side of the
keyboard and have integral buttons which have the same function as mouse buttons.
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