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PC Hardware in a Nutshell, 3rd Edition by Barbara Fritchman Thompson, Robert Bruce Thompson

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Chapter 20. Mice and Trackballs

Mice and trackballs are members of a class generically described as pointing devices. All pointing devices have the same purpose—allowing you to move the cursor (or pointer) around the screen and to click to select items or perform other functions. A great variety of fiendishly clever pointing devices are built into notebook computers, but nearly all desktop systems use mice. Those few that don’t, use a trackball, which are essentially belly-up mice with their balls showing.

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