A device that acts as the input one, but seeing the work. It is typically used as an arrow, move the control to different positions on the screen is suitable for use to select or move an object on the screen.
An input device that acts like one, but it works. Generally, it is used to control the arrow keys to move to different locations on the screen for user to select. Or move objects on the screen
A device that serves as input 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.