title: Sys.require vs Sys.loadscripts vs Sys.loader
body: <p>I'm finding it hard to find clear documentation on loading scripts using the Microsoft AJAX framework.</p>
  
  <p>Can someone tell me the difference between:</p>
  
  <ul>
  <li>Sys.require</li>
  <li>Sys.loadscripts</li>
  <li>Sys.loader.registerScripts</li>
  <li>Sys.loader.defineScripts</li>
  </ul>