It allows the MBL to keep you connected to an IRC server at all times without having to keep an IRC client running on a computer and such. And when you do connect from a client it plays back everything you missed that was typed while you weren’t physically connected to to server but your MBL was.
In all honesty though it is a _____ to setup and I don’t know if it would be worth my time putting a guide together for it at this point.