title: Emacs C++, opening corresponding header file
body: <p>I am new to emacs and I was wondering</p>
  
  <ul>
  <li><p>if there is a shortcut to switch between header/source and the corresponding source/header file</p></li>
  <li><p>if there is a reference card like the general emacs ref card</p></li>
  </ul>
  
  <p>Thanks !</p>