You are looking at documentation for an older release. Not what you want? See the current release documentation.
By reading this section you are already glancing at the heart of eXo Kernel. This section provides basic knowledge of modes, services and containers. Also, you will find out where the service configuration files should be placed, and the overriding mechanism of configurations. Finally, you will understand how the container creates the services one after the other.
If you wish to see examples of service configurations, you should study the Core where you find descriptions of some eXo's core services.
Finally, you might wish to read more about PicoContainer.