Трекболы
Trackballs are similar to the basic computer mouse. The trackball is a device for pointing and consists of a ball, held in place by a socket that contains a sensor.
How to use a Trackball
Roll the ball using your thumb, finger or the palm of your hand to position the pointer on your screen. You can use your fingertips to press the buttons on the mouse.
Benefits of using a Trac...
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