A script/custom application should be able to add a particle system to a prim, just create a new libsecondlife.Primitive.ParticleSystem() and then call AddNewParticleSystem() on the OpenSim particle : we really need to rename our particle class to stop conflict with the one in libsl.

OpenSim/Region/Examples/SimpleApp/CpuCounterObject.cs

@@ -19,7 +19,7 @@ namespace SimpleApp
             String objectName = "Processor";
             String counterName = "% Processor Time";
             String instanceName = "_Total";
-
+         
             m_counter = new PerformanceCounter(objectName, counterName, instanceName);
         }