title: How to get a unique computer identifier in Java (like disk ID or motherboard ID)?
body: <p>I'd like to get an id unique to a computer with Java, on Windows, MacOS and, if possible, Linux. It could be a disk UUID, motherboard S/N...</p>
  
  <p><code>Runtime.getRuntime().exec</code> can be used (it is not an applet).</p>
  
  <p>Ideas?</p>