I'm working (more or less) in Java. I'm planning to start picking through the Scribe library to see the flow.
The flow (http://dev.twitter.com/images/dev/oauth_diagram.png) makes sense. What I'm having difficulty with is mapping the pieces of that diagram to the single token solution. What steps from the diagram (and in what sequence) apply to the STS? Also, in the case of server-side accesses, what is the mapping of Twitter "application registrations" to Twitter IDs? One app's registration can access multiple Twitter IDs (concurrently) or is it one app/reg per TwID?