On a web page you you have a submit button. A server side CGI file is executed when the browser submit button is clicked. On NT, it is usually an EXE file at the end of a URL, in the cgi-win directory.
Example cgi url
oCGI.put([form action="http://www.MyWebSite.com/cgi-win/chekpost.exe" method="POST"])

>Hi,
>
>What in the world is a .cgi file and how do I open it?
>
>Thanks,