Ok, in all technicality, CGI:IRC is basically what allows people to connect to the server via external means rather than an IRC client like mIRC or X-Chat, or even Ircle on the Mac. The support gives the added benefit that no one has to download a dedicated client, and use a service such as Mibbit.com.
At this very time, the only protocol allowed is Mibbit, a web-based IRC client using AJAX rather than Java, which is slower to respond and must be re-compiled each time it is run. However, people can use whatever they wish. To join ShadowHime through Mibbit, just enter our IRC link (leave the irc:// off ^_~), enter a channel and your all set.