I recommend you to look into the COM API and the design chart for your DCOM application.
webMethods allows methods in existing COM and DCOM objects to be invoked. Similarly, COM applications written in Visual Basic, Visual C++ or C# can call any services running on the webMethods Integration Platform. A single link provides a way for COM-based applications to access any application.
There are some interesting results if you do a Search Forums :DCOM here on wMUsers.
#webMethods#webMethods-General#webMethods-Architecture#Integration-Server-and-ESB