The VDF is a high-level framework on top of the existing API that provides:
The VDF mission is to deliver extensible, light-weight data management components that allow new add-ins and clients to be created quickly and to enable existing add-ins to benefit from continued feature development and enhancements.
The diagram below shows a diagram of how the VDF relates to the Vault Server and your client applications.
The VDF has an installer that is included in the Vault Client and Server installation. A VDF installation includes the API binaries, sample applications, and a help file.
C:\Program Files\Autodesk\Vault Professional 2014\SDK\setup.exe
C:\Program Files\Autodesk\ADMS Professional 2014\SDK\setup.exe