title: What's the difference between a free build and a checked build?
body: <p>I just installed the <a href="http://msdn.microsoft.com/en-us/windows/hardware/gg454513" rel="nofollow">Windows Driver Kit for XP - Windows 7</a> and this may come as a silly question, but what is the difference between a "free build" and a "checked build"?</p>
  
  <p>PS: I'm not a driver developer, I installed it merely to check some header files for P/Invoke.</p>