>>A Parameter object - yes, this is what I'm looking for. Can you be more explicit.

You can pass parameters as XML to your COM objects. In your XML, you need at least a parameters element and a method name element. When your COM object recieves the XML, it parses it with the XMLDOM or if it is just a small string, do it manually. Then it knows what method to call and what parameters to pass to it.

If the COM object is hosted by MTS, you use GetObjectContext() to become stateful and SetComplete() to release state.

Charlie