PC Hardware in a Nutshell, 3rd Edition [Electronic resources] نسخه متنی

Chapter 20. Mice and Trackballs

Mice and trackballs are members of a class generically described as
pointing devices. All pointing devices have the
same purposeallowing 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.