Replying to Fks 155s and 185s

i have the 155s on my fujis and i never really looked at them, but im sitting here thinking how the hell does the toe piece work?. from wut i remember it doesnt move at all(like the other rossi and look bindings how the little thing where the toe goes in moves side to side), so why is there a din adjuster on it? bascily how does the binding work in general. like i said ive never really looked at them. im really curious to know. i could be comepletley wrong with what im saying though. any one?