title: What is winapifamily.h?
body: <p>Can't find it in Windows SDK and DDK, but some of our existing code includes it. 
  The only meaningful link I found by Google is: <a href="http://msdn.microsoft.com/en-us/library/windows/hardware/hh450839%28v=vs.85%29.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/windows/hardware/hh450839%28v=vs.85%29.aspx</a>
  What's it?</p>