A Variation on the mouse is the trackball.You may have used a trackball to play a video game.The trackball is like an upside down mouse, you roll the ball directly with your hand.The popularity of the trackball blast with the advent of laptop computers, when traveling users found themselves without a flat surface on which to foll the traditional mouse.Trackballs are often built in on portable computers, but they can also be used as separate input devices with standard desktop computers.Many users prefer trackball because it requires less desk space when in operation.

ajab khan

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