1. 
   Concept keyboard
   an input device consisting of a flat panel, usually A4 or A3 sized, that has a matrix of pressure switches below the surface - different sheets, called overlays, can be placed on top of the panel to show the user which areas to press to get certain responses from the application software that is cur...
   Found op http://www.archivemag.co.uk/
   
   
2. 
   concept keyboard
   An input device which is similar to a graphics tablet in appearance. The computer is able to detect the precise point at which the surface of the board is touched.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   concept keyboard
   In computing, a keyboard containing a continuous surface that can be defined as anywhere from 1 to 256 keys. A wide variety of overlays are available from third-party manufacturers. One use of concept keyboards is to facilitate access to a computer for the disabled
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0097871.html
   
   

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