title: What is the use of federated user repository VMM
body: <p>I have read about the federated user repository VMM from <a href="http://www.ibm.com/developerworks/websphere/techjournal/0701_ilechko/0701_ilechko.html" rel="nofollow" title="Federated user repository ">WebSphere Developer Technical Journal: Expand your user registry options with a federated repository</a></p>
  
  <p>I'd like to know the following things:</p>
  
  <ul>
  <li>What are the uses of federated user repository and VMM?</li>
  <li>Can we use these repository directly in the application which is deployed in that server? If yes then how to refer to this repository in application?</li>
  <li>The document also says about the limitations as well, so are these limitations also present in WAS 7.0 ND?</li>
  </ul>