a) Touch pads: Touchpad is a flat surface or the screen with touch sensitive points or programs icons. When specific point or icon is touched by finger tips, related program or prompts are activated. It is also called a track pad. Touch pads are usually in laptop which acts as a mouse.
b) Light pens: Light pen is an input pointing device used to draw diagram on VDU (Visual Display Unit) directly. It is connected with VDU. The tip of pen contains light sensitive element which provides a very precise pointing capability directly on the screen. It is used in engineering drawing, architect design, circuit design and other several graphics and art works. It is also used as pointing device for menu displayed on VDU like as mouse.
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