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Overlay keyboard
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<p>An overlay keyboard or concept keyboard is a specialized <a href="/facts/Computer_keyboard/MczF9LIS">keyboard</a> with no preset keys. Each key can be programmed with a wide range of different functions. Overlay keyboards are often used as a quick and easy way to input items with just two buttons. </p><p>Overlay keyboards generally consist of a flat grid of unmarked buttons. A sheet called an overlay is placed on the keyboard to identify each key, after the keyboard is programmed. The overlay can consist of any combination of words, symbols, or pictures. </p>