title: What is a HTREEITEM?
body: <p>I am trying to debug some Tree View code, and I want to check that the <code>HTREEITEM</code> returned by <code>CTreeCtrl.InsertItem</code> is valid in memory.</p>
  
  <p>However I cannot find any documentation for <code>HTREEITEM</code> in any of the places I usually check (Google, MSDN, Coworkers), only a whole bunch of people asking the same question.</p>
  
  <p>Do you know what <code>HTREEITEM</code> is defined as? Do you know any good links that detail the internal structure of a <code>HTREEITEM</code>?</p>
  
  <p><em>I am working in C++, but C references would also be helpful.</em></p>