Touchscreens let you interact with them in exactly one way: by poking your finger at them. It's the equivalent of the Mac's one-button mouse, which was probably exactly what Steve Jobs intended. But in practice, it would sometimes be convenient to have the touchscreen equivalent of a "right click"--to invoke contextual menus, for example, or even just to distinguish certain kinds of input from others. Chris Harrison, an interaction designer at Carnegie Mellon University whose work we regularly cover, came up with a solution called TapSense.
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