This is the a brief overview of what you can find in the Orion Enginge Section : (Note: these are working drafts)
Client/Server
Describes how client & server should work.
Engine
Describes what to expect from the engine.
Networking
Description of how to handle networking stuff.
Object Orienting
Description of the object orientated nature of the engine.
XML - mapping
Description of how maps & models could be made.