title: What does it mean when you check on "Recursive" in Header Search Paths
body: <p>I've been referencing a lot of Projects, and i do it through adding their paths in Header Search Paths.</p>
  
  <p>I've been following the referencing stuffs through the "Referenced Project's" getting Started <em>(like for example including the ZXingWidget)</em>.</p>
  
  <p>And I've been doing it a lot now, but I don't understand the checking of recursive.</p>
  
  <ol>
  <li>What does this mean?</li>
  <li>When do I check a path for "recursive?"</li>
  </ol>
  
  <p>Thanks</p>