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This device is commonly found on notebook computers and by moving your finger across the pad the movement of the cursor or clicking which is positioned next to the touchpad. It has the same uses, advantages

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Introduction

1) Tracker Ball This device is like an upside down mouse because the ball normally located on the underside of the mouse device is located on top of the tracker ball. The user rolls the ball with the finger to control the cursor movement. Sometimes we see small tracker balls on notebooks. They take up less space than a hand held mouse device but have same uses, advantages and disadvantages. Advantages * Some people find it much easier to select items and start tasks by clicking icons choosing from menus rather than typing commands. * It is more often a faster method of getting to the tasks you want to start. * It is quicker to use a mouse to help you move around a document than to use the arrows on the keyboard. Disadvantages * People new to computers often find it difficult to control the movement of the pointer on the computer screen by moving the mouse around the desk. ...read more.

Middle

They also have difficulty when double clicking the mouse button. Joystick Game Software often takes input from a joystick. Advantages * There is an immediate feel of direction due to the movement of the stick Disadvantages * Some people find the joystick difficult to control rather than the other point and click devices. This is probably because more aim and wrist movement is required to control the pointer than with a mouse or trackerball. * Joysticks are not particularly strong and can break easily when used with games software. Keyboard Keyboards are found on everyday general purpose computers like desktops and note books the usual layout of the keys on the keyboard is rather like the layout of the keys on a typewriter. The top row of letters start with 'QWERTY' this is why they are called QWERTY keyboards. Keyboards come in many shapes and sizes depending on the design of the computer. In recent years a lot of work has been done to design ergonomic keyboards that are more comfortable. ...read more.

Conclusion

The right most buttons is often used to display a menu of choices you can make about an item on the screen. Underneath the mouse is a moving ball which allows the mouse to be manipulated in such a way that as the ball rolls and the mouse moves, so does the cursor on the screen. Advantages * Some people find it much easier to select items and start tasks by clicking icons choosing from menus rather than typing commands. * It is more often a faster method of getting to the tasks you want to start. * It is quicker to use a mouse to help you move around a document than to use the arrows on the keyboard. Disadvantages * People new to computers often find it difficult to control the movement of the pointer on the computer screen by moving the mouse around the desk. They also have difficulty when double clicking the mouse button. * Mouse balls can become very dirty and stop functioning correctly unless cleaned regularly. ...read more.

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