Frond End Assistance And Iterative Clean Up

This relates to XX-4076 and XX-4092. This is largely cleaning up documentation for front end. There was also clean up where I identified a bug in the client registration code-path as well a poorly named method off of reception identity.

This also included exposing IsRegisteredWithUd after front end specifically asked for a method to have UD registration context; they need to know if they have to show the page where the user inputs a username if not registered.