Beginner:
This site provides links to sample movies created with the simulator
along with explanations of exactly is happening.
Intermediate:
Here you can run the simulator with a limited number of required input
parameters.
Expert:
The complete simulator with all available parameters.
Additionally, an information page has
been provided to explain the simulator and the required parameters and
a separate technical
paper in pdf format is available that describes in detail the
physics behind the simulator as well as how to use it.