This video shows how Autodesk Vault interacts with Revit server and how to configure them both across different sites connected through a WAN. The demo at the end shows the workflow between different sites.
You will also notice the handling of a referenced DWG in a Revit shared project through Autodesk Vault Professional. The demo shows how and why the combination of Vault and Revit server is the perfect solution for cross-site collaboration.