title: How to integrate vBulletin auth with my site?
body: <p>I need to use vBulletin auth system on the rest of my site.
  Does vB has any APIs for that?</p>
  
  <p>Im expecting to find something like that:</p>
  
  <pre><code>if($vBulletin-&gt;isAuthenticated())
  {
      // user authenticated
  }
  </code></pre>
  
  <p>In case of vB does not have such API, is there any other ways to check if user is authenticated?</p>