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" is simply an arrow that lets the user know where its position is on the screen. In addition to a mouse some people prefer trackballs. A mouse and a trackball can be contrasted in terms of their physical shape, logical functionality, and space consumption. A mouse and a trackball ....