Touchpad is the most popular interfaces. This is the precursor of the touch screen interface. Most of the touchpad is now multi-touch capabilities. as in 1984, started by Bill Buxton is the touchpad is now getting competition from a trackball or joystick button. But it is the most popular interface for handheld computers.
Attention touch screen interface is now one of the hottest on the market. Apple iPhone is very important in order to revive the potential of this approach. Mobile phone market that supports multi-touch screens are flooded. Multi-touch screen can be activated by various techniques such as capacitive pressure sensors, infrared sensors and surface acoustic wave.
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