IE Intergration (Pluggable Protocols)

Question

I am currently developing an application that mixes classic client computing with ASP.NET server computing to a very high level. One of the features of this is a built in browser window (using a .NET wrapper around the Microsoft WebBrowser control). This is actually working very well. The one area I have a concern with is when the server wants to direct the client side software to perform special actions. I am well aware that I could do much of this with a WebService, or even better a remoted object (with maintained state, events etc.), but I am looking at an alternative.... Internet Explorer supports plugabble protocols. I have sucessfully used these in a number of previous applications. While associating a protocol with an executable is quite trivial (just a registry key set), I have found it to be better to associate a class with the protocol for the duration of my application. If the reader is aware of what I am talking about, then they will realize that I am talking about a class derived fro IInternetProtocol and othere Interface classes. I have done this in the past using MFC, but am looking for an implementation that is either 100% .NET or nearly so. I have been searching the Web, and have not found any samples (C# preferred, but I can translate....). If anyone has any lead, I would greatly appreciate hearing from you. David.