I've been wanting to share this diagram for a while and since today is going to be an "interesting news" day [and insert a Leap Year day joke here too] I thought it a good fit...
Kinect for Windows SDK - NUI
The Kinect for Windows SDK provides the tools and APIs, both native and managed to develop Kinect-enabled applications for Microsoft Windows. Developing Kinect-enabled application includes additional NUI processing support for color images, depth images, audio input, and skeletal data.
Project Information URL: http://blogs.msdn.com/b/ampuri/archive/2012/02/09/kinect-for-windows-sdk-nui.aspx