Preloads doesnt really work :S

[Putmalk]

Preloads don't spawn a particle system, you're looking for:

CreateParticleSystemAtEntity(string& asPSName, string& asPSFile, string& asEntity, bool abSavePS);

source:
http://wiki.frictionalgames.com/hpl2/amn..._functions

Preloading is only done in the OnEnter function, and I don't necessarily know the purpose of it - I do believe it removes the lag that happens when events fire.