http://www.safeeggs.com/how_we_do_it/index.html has a javascript link that opens window with a series of pictures showing how they pasteurize the eggs.
The summary is a warm water bath with regulated temperature and time based on the size of the egg.
Just as with boiled eggs, the protective membrane on the outside of the egg is destroyed in this process so the egg is coated with wax to prevent contamination/infection after the pasteurization process.
The eggs are stamped with a circle P to show they are pasteurized eggs.
The details of the times and temperatures aren't given, but I'm sure they're available in the patent literature.
Phil