title: How does the preloader work in as3?
body: <p>I've read multiple examples on this, but I just don't get how it works.</p>
  
  <ul>
  <li>How does the class know it's <em>THE</em> pre-loader?</li>
  <li>How does flash know to load one class but not another?</li>
  <li>How much can I do in a preloader? :-p</li>
  </ul>
  
  <p>I'm using FlashDevelop atm and it's generating the project for me - however, from all the examples I checked they didn't explain how it worked either.</p>