WCF & Workflow

Hi All

I am working on a project where i am trying to do following:

Server (console app):
1. host workflow as WorkflowRuntime
2. host WCF as ServiceHost

Client:
1. Client uses WCF service to send communication to the wcf
servicehost

I have following question:
I want to use use ExternalDataExchangeService to communicate between
WCF servicehost object & workflow runtime object. But how can i do
that?
Note: I don't want to host Workflow as WCF service.

Can someone please provide a simple exampel for it??

Thanks
Sunny