PtcStyle : Syle of the particle, restart to take effect. 1:smoke, 2:steam, 3:flames, 4:water. PtcMoveStyle: Simulates collision when active, very laggy. PtcStartTrnsp: Alpha for newly generated particles. PtcColTransit: particles changing color (e.g. flames going from yellow to red at -1). Might cause slight lag. PtcGrav: acceleration along y-axis(e.g. 10 for falling water, -3 for rising smoke). PtcSpeed: movement on generation, in random direction.
As always, I'd like to thank Me, Myself, and I.