So there's multiple tiers being used in the demo. Nodeler itself is just for Node A finding Node B. Developers are free to define their own protocols to communicate between Nodes.

An add-on for developers will be the "Nodeler Central" communication servers which uses Node.js to accept web socket or tcp socket connections to create real-time communication between Nodes. This is what the demo apps are using.

Pretty much everything so far is javascript and C#.

More about the technologies is covered towards the bottom of this blog post: http://blog.cdeutsch.com/2011/05/introducing-nodeler.html