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...1994. The touch pad has since become the leading cursor controlling device in laptops. Many laptops use a trackball. IBM ThinkPad laptops use a "pointing stick" (called a TrackPoint) that is set into the keyboard. How the Touch Pad Works The touch pad contains several layers of material. The top layer is the pad that you touch. Beneath it are layers (separated by very thin insulation) containing horizontal and vertical rows of electrodes that form a grid. Beneath these layers is a circuit board to which the electrode layers are connected. The layers with electrodes are charged with a constant alternating current (AC). As the finger approaches the electrode grid, the current is interrupted and the interruption is detected by the circuit board. The initial location where the finger touches the pad is registered so that subsequent finger movement will be related to that initial point. Some touch pads contain two special places where...