title: Several questions regarding Vim NERDTree
body: <ol>
  <li>Is it possible to set a default directory that the explorer window always opens up in?</li>
  <li>How do you move cursor from the file explorer to the editor buffer? (on a normal gui-based editor I'd click onto it)</li>
  <li>How do you move the cursor from the editor buffer thing to the file explorer?</li>
  </ol>