Source Code
The project source is stored on SourceForge in a Subversion repository. It is highly recommended to register on SourceForge, it enables for example contributing to the project code.
The source code repository uses a typical trunk, tags and branches structure. tags contains all releases, and branches all temporary branches. The working tree is under trunk.
Starting Points
nwt is a good starting point to observe how RDCL works. It allows logging of the communications via the --log option, and the operations of the different actors in nwt can be followed by setting the log_transitions instance variable to true for classes which are derived from DFA
Feature and Bug Fix Requests
SourceForge also hosts the feature and error tracker for RDCL, and uses trac for this purpose. It is another good starting point for contributions: