stupid computer question

can someone PLEASE explain to me how touch screens work ?? in simple lanquage if possible.

thank you,

surfer

 

http://electronics.howstuffworks.com/question716.htm

 

gg,

thank you !

surfer

 

http://www.fashionwatch.com/2002/fall2002/tissot/

 

very cool, 777.

surfer

 

Why is this is in Chit-Chat when it could very well belong in Hardware?
No personal attacks or political haranguing going on here.
And how do I make my picture show in my message not in an attachment?