[ALUG] How to execute something from a web page (i.e. hung on a button) without affecting the web page?

I want to have a button on a web page that executes some code (currently a bash script) but which isn't 'real' CGI in that it doesn't send anything back to the web server. I want nothing at all to happen to the web page when the button is clcked. Is there some sort of CGI 'output' which does nothing at all? -- Chris Green