How to run a computer program and use its output in website

Hi,
I want to make an web application where if an event occurs (say user
clicks execute me) than a program triggers on my computer, does some
thing and then returns the data back to the site so that i can show
the result to the visitor

lets make it more understandable
see this diagram http://www.pixel-touch.com/untitled.bmp

I badly need help

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