[Closed] RS Revelations - Can you explain the air chambers to me?

I've read the manual but am still a bit confused by the +ve and -ve air chambers on Revelations. For the sake of this new forum (there were explanations on the old one I think), could someone explain to me what they do?

My guess is the +ve chamber is used to moderate the spring pressure (for want of a better description) for the majority of the fork travel, and the -ve chamber air pressure only comes into play when the fork is nearing full travel and can control how easily the fork bottoms out...?