A device that performs data entry, but at work. In General, it is used to control the arrow to move it to the location on the monitor is suitable for use to select or move an object on the screen.
Input devices that act like one, but it works. Generally, it is used to control the arrow keys to move to different locations on the screen to select suitable for use. Or move objects on the screen
Job input device one but saw work. In general, will be used to control the arrow keys to move to the position on the monitor is suitable for use to choose or move objects. On the screen.