To use the Mac Mini as a web server you’ll need a few things. First, you’ll need to be able to reach the Mini from outside your network. You can accomplished this by getting a free account at DynDNS. You can also pick from a few free domains, most of them pretty terrible. You’ll then need to download and install their free IP updater client. This small app runs in the background and updates your dynamic IP to DynDNS. This way, when you type in your chosen domain name, your DynDNS account will always know to send the request to the correct IP and get the Mac Mini.