A touchscreen is a display which can detect the presence and
location of a touch within the display area. The term generally refers to touch
or contact to the display of the device by a finger or hand. Touchscreens can
also sense other passive objects, such as a stylus. However, if the object
sensed is active, as with a light pen, the term touchscreen is generally not
applicable. The ability to interact directly with a display typically indicates
the presence of a touchscreen.
The touchscreen has two main attributes. First, it enables
one to interact with what is displayed directly on the screen, where it is
displayed, rather than indirectly with a mouse or touchpad. Secondly, it lets
one do so without requiring any intermediate device, again, such as a stylus
that needs to be held in the hand. Such displays can be attached to computers
or, as terminals, to networks. They also play a prominent role in the design of
digital appliances such as the personal digital assistant (PDA), satellite
navigation devices, mobile phones, and video games.
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