Topic: Restful_Authentication....has anyone waded through this?

I'm trying to work my way through the Restful_Authentication plugin that Rick Olson wrote and Ben Curtis put into his startup module.
I feel I can follow it through but am unable to ADD the first USER record. When tracing through the logic, it seems like everything would work fine if the user has a COOKIE that is then used to feed the SESSION array.
The logic to trace this along is long and involved. I don't really know how to ask this question, other than has someone broken through to the 'other side' of this topic?
Or possibly, is there a link or written explanation of how the logic works for Restful_Authentication?
Thank you,
Kathy