Oooh, a particle effects system. Neat! Poser was just upgraded to 3.xx version of Python, and most of the effects systems have been implemented through that. There is an SDK,, but what its status is is unknown at this time. Irregardless if there is a free version or not, they are pushing to get P-12 out the door, so the odds of having a stable sdk depends on where they are in the dev cycle.

Now if some crazy coder could recreate a runtime metaball generator, that would take care of particles **and **fluids.