That article was great, but, do you really think it covers it all? Well, if you can define "all", then maybe I can answer that. ;)
The article provided an overview of COM Interop, showed how a .NET app can access VFP components and data, and also showed how VFP can call .NET components and .NET web services. I think it covers the fundamentals very well, and provides some examples.
If there were specific areas that would have been beneficial to cover, that's one thing - but an expectation of an article/white paper covering it "all" is not realistic.
Again, what specifically would you like to see covered that wasn't covered in CoDeFocus?
Kevin