Beats me. The program has no configuration option that allows you to do that, so it must be something customized by someone else, and probably requires setting something in the Web server's configuration to make it work. For instance, in Apache, the two lines you could add would be:

ScriptAlias /pod/ /home/toyourcgibin/httpd/cgi-bin/
Redirect /pod http://grohol.com/cgi-bin/pod.cgi

and this allows the format of:

http://grohol.com/pod/

to be taken directly to the computers category or the top level. But if you look in the URL line, it's still just a redirect and it shows the cgi program again. So it's probably even more complicated than that.