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The keyboard is the most widely used input device and is used to enter data or commands to the computer

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Introduction

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Middle

You might have heard the expressions 'double click', 'click and drag' and 'drag and drop'. Most mice use a small ball located underneath them to calculate the direction that you are moving the mouse in. The movement of the ball causes two rollers to rotate inside the mouse; one records the movement in a north-south direction and the other records the east-west movement. The mouse monitors how far the ball turns and in what direction and sends this information to the computer to move the pointer. Advantages: Ideal for use with desktop computers. Usually supplied with a computer so no additional cost. All computer users tend to be familiar with using them. Disadvantages They need a flat space close to the computer. The mouse cannot easily be used with laptop, notebook or palmtop computers. (These need a tracker ball or a touch sensitive pad called a touch pad). Trackball A tracker ball, is like an upside down mouse with the ball on top. ...read more.

Conclusion

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