Often people embed an image in their page that shows how many times this page
has been accessed. This image is generated by a CGI application that keeps track
of how many times a URL has been hit.
The following embedded image has been generated by a CGI that takes a single parameter
and returns an image showing how many time it has been called with this parameter.
The HTML code for the image is
<IMG SRC="/cgi-bin/counter.vi?/cgi-bin/examples/counter.htm">
When you reload the page, the CGI is called again and the number in the image is
incremented.