touch screen experience please?

[alan c]

I am being asked to comment on procurement of a touch screen - an 
external one which fits over the front of the display.
A desktop compatible model is shown with no mention of how it 
connects. A laptop version is also shown with a comment that it is USB.

Does anyone know if the technology is very likely to be easily 
compatible with USB as available in Ubuntu? Or are the various patents 
likely to force particular software drivers?

The site I am looking at (for uk) is
http://www.techready.co.uk/Assistive-Technology/Touch-Screens
tia
-- 
alan cocks
Kubuntu user#10391