A touch screen is a clear sheet of plastic with tiny sensors that detect pressure from either a finger tip or a pointing device. When these sensors are pressed, they perform the functions found with the traditional mouse; single click, double click and drag. A typical touch screen input system is basically an input device like a mouse or trackpad. A touch screen system is made up of a sensor, a controller card, and a software driver. Touch screen systems are being used in a variety of applications, including point of sale systems, public information displays, industrial control systems, and more.