Is a touch screen that is up to four feet by six feet.
a plasma screen
a multitouch interface
an electronic paper display
an electronic notebook

Multi-touch interface is a touch screen that is up to four feet by six feet.

This technology enables input through pressure and gestures on multiple points on the surface of a device, without mouse or mechanical keyboard.  The specialized touch-sensitive display surface detects multiple points of contact (touches) and can recognize certain gestures.

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