The following list illustrates the major points of what happens, in chronological order.

A Java applet will initialize and the geometry that will be used in the gamma flux calculation will be set up. At this stage, the program also tries to send information regarding the version and manufacturer of the java machine to the server.
The applet will perform a ray trace of gamma rays with a pseudo random source point distribution within the geometry to calculate the transmission of the gamma rays as they pass through. A status bar in the graphics version at the bottom of the applet informs you how much work is to be done before the applet will be ready, it is ready when it reaches the right side.
When the trace is ready, the applet will try to connect to a server and transmit the calculated data. The amount of data to be sent is approximately 1 kByte, per calculated field point. If it does not connect, the trace will continue with another batch of gamma rays (a new field point) and try to connect again at a later time. If you are behind a firewall that does not permit this kind of communication, then the connection will not work, you can check this using the java console.
The applet continues to calculate and send data back to the server until you tell the browser to do other stuff.
That's it!

Some word about the physics of what is calculated can be found in the physics pages.

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