Communicating with a Silverlight 4 LocalMessageReceiver from a Desktop Application

I am working on a little Helper Application for a Silverlight 4 OOB App that can be installed to enhance the capabilities of the SL a bit (improved Clipboard Support, Global Hotkeys etc).

I know that Silverlight's Local Message API is based on ALPC which is a rather undocumented Windows API but still, is there a way to talk to the LocalMessageRe开发者_如何学编程ceiver from a non-silverlight application that I might have overlooked?

Otherwise I might need to stick to Plan B: a listening socket in the Helper App that the SL app connects to (SL app runs on elevated trust).