[NTG-context] Inter-document Cross References

I am trying to create cross references that span two documents, but am having trouble figuring out exactly how to generate PDFs where the cross references from one document to the other work. I'm following the project/product/component structure and my two documents are each a product in the same project. I normally run texexec from within the product directory, when I try running it from the project directory there is no output. Is it possible to have documents reference each other in this way? Why piece am I missing? I've looked through the documentation, wiki, google, this list, etc and I'm either searching for the wrong thing or there is nothing written about it. Thanks, Adam