I have been corresponding with Norm privately through a support incident. We do provide examples on using this native/managed communication within the Samples Browser if the Compatibility Addpack is installed (Dialog System components). There are a couple demos available that show how to pass a pointer to a native entry point to a managed program so that it can be called from managed. There is also a demo that shows how a .NET program packaged as an activex control can generate events that can be consumed by the native program using an OLE control program approach.
Creating this type of hybrid system is certainly not for the faint of heart.