Beginning of Essay
Computers incorporate various pieces of equipment that allow the user to interact with the software. Since the idea of a Graphical User Interface (GUI) has been accepted, people rely on a mouse to move the "cursor" around the screen. Most of the time the "cursor ....

Middle of Essay
.... a ball. The ball is located on the topside of the trackball and movement is performed with the thumb instead of the whole hand that is easier and it consumes less time than using the whole hand. Therefore, the mouse and the trackball are different in their shape but they both perform the same task. A trackball is stationary and therefore minimal; space is needed to allow movement while a mouse needs to move to perform its task. Both devices have buttons on the top, usually two or three depending on the manufacturer, that allows the user to select items on the screen, almost acting like an "enter" button. After having experience with both devic ....