It can be a value of 1 or greater. The one with the "1" will be loaded first, and then the others in ascending order.
Note that starting with Servlet API 2.3, the concept of javax.servlet.ServletContextListener can be used to initialize anything that needs initializing. That is a much cleaner solution than having a servlet that does not actually serve anthing.
Ping & DNS - updated with new look and Ping home screen widget