is a Windows client for IRC (Internet Relay Chat). PHP
is a web scripting language (this forum is written in PHP) used for various different things, and an IRC client has been written it for use on websites. There are other alternatives, like CGI IRC.
I agree that a chat room would probably be more like general chat and banter, maybe more getting to know each other than having major debates which would remain on the forum. But we'll leave that up to everyone to decide upon, maybe a vote is in order?