Particle Effects->revolving around a set point.

[Vulgar]

Ok, I have been trying to figure out how to make particles revolve around a player or a set point like lets say a lamp. I have been looking around and haven't been able to find anything that will explain how I can accomplish this. I have been out of school for a few years now and I totally forgot how sin cos and tan are used so I don't know if I would need to use those to accomplish it. If someone could point me in the right direction that would be awesome.