Overlay keyboard

An overlay keyboard or concept keyboard is a specialized keyboard 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.

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.

Advantages

Overlay keyboards have several advantages over conventional keyboards or mice. They do not require memorization of shortcut keys (i.e. F5, Alt+S, etc.) nor do they require a great deal of fine motor control, making them ideal for people who have difficulty using a conventional keyboard. Overlay keyboards are easy to clean, and resistant to spills or dust. The ability to change overlay sheets also makes it easy for a single overlay keyboard to have several different uses.

Usage

Overlay keyboards are probably most often found in fast food restaurants, where they reduce the amount of time required to enter items. Overlay keyboards are also used in education, especially at the primary level. They can also be used by disabled people who have sensory or motor control difficulties.[1][2]

gollark: PotatOS is highly "secured" because it has two separate elliptic curve cryptography things in it.
gollark: .
gollark: I'm not, blame "Dimaguy"
gollark: It protects you against the case where someone can somehow *read* your network traffic but not *alter* it, maybe. But that's not really worth lots of (rather horrible) code, probable insecurity, and extra complexity.
gollark: Yes, I'm aware, but if your TEA thing is exploitable somehow, then someone can probably use that to log in, since you authenticate that way.

References
  1. P. Blenkhorn, "Switch, overlay keyboard and touch screen software for children and adults with profound and multiple disabilities", Feb. 24, 1998, accessed Sept. 22, 2007
  2. "Everything You Need to Know about Overlay Keyboards", accessed 29 July 2009
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