After reading this I think I get it. [Most of my personal knowledge of suspension forks comes from motorcycles, so my context below may make more sense if you also understand said.]
http://www.pvdwiki.com/index.php?title=Tuning_Rock_Shox_Dual_Air_Forks
The "positive" air spring is analogous to a traditional coil spring. More pressure equals stiffer spring, and it takes more force to compress anywhere in the stroke versus lower pressure. Compression and rebound must be adjusted to suit.
The "negative" air spring is analogous to a preload spacer on top of the spring. It puts the positive spring under load and you have to exceed that load in order to initiate movement of the positive spring. Since it is a gas and not a solid thing, I think it will act a bit differently throughout the stroke, but that may be a good thing and make for a more progressive system.
And I don't need to replace the rebound adjuster that is missing on my bike. A 2.5mm allen (hex) key of sufficient length is all you need. The OEM knob is just a nice package job of an allen key. Until it falls off.
Conclusion:
Success. Now I have everything I need to make note of how my suspension was delivered, and which direction I should go to start using most of the travel on the forks instead of the 30-40% that's been used so far.
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