title: Creating a POPUP style window
body: <p>I have an answer regarding creation of the POPUP style window. The thing that do really bothers me is the <code>hWndParent</code> parameter. The docs says:</p>
  <blockquote>
  <p>This parameter is optional for pop-up windows</p>
  </blockquote>
  <p>My question is how does the POPUP window created with the <code>hWndParent</code> parameter set just to <code>NULL</code> behaves? Does it belong to the desktop itself? How is it z-ordered/displayed on the screen? Does it spwan above all other windows or just only over the desktop such that other windows covers it?</p>