Find below a collection of resources which should be interesting for people trying to dig into the internals of OpenGroupware.org. The content will be enhanced over the next weeks.

So far we have a nice diagram on the basic OpenGroupware.org architecture. Note that some components are not supported in all levels (yet!). For example the MacOSX port is only done up to the Logic layer.
[Diagram]

Almost any information contained in OpenGroupware.org can be accessed using it's XML-RPC interface from almost any programming language. This opens a wide door for extending OGo with standard Linux utilities and for integration into an existing infrastructure.
Use it to dump OGo data into LDAP servers, to let OGo transfer documents into the versioned storage by email or just to import the data extracted from your old, proprietary Groupware into OGo.
[XML-RPC API]

OpenGroupware.org uses standard SQL databases as a storage backend for most of it's data. In contrast to various other solutions OGo uses a highly structured and human readable database schema.
[Database Schema]

SOPE is the application server OpenGroupware.org is built upon. In OGo the SOPE directory also contains the XML and Core libraries, since those are required for sope-appserver.