Its essentially a replacement for Play By Email type games that many of us on this site played in the past. You enter your orders on these webpages, then when the GM clicks, process turn, it follows your orders as well as it can (which is why orders are button based instead of text based) Battles are fought in a computer, and your pages are updated. Then you repeat the process. Grapically it is supposed to be very limited to allow for even Dial-up users to play on it with little loss of control ability.
I may get into more details when I get back from work...assuming I don't crash as soon as I get in.