title: WCF sessions or pass username/password per call?
body: <p>For an enterprise type WCF service, where potentially 10K's of thousands of clients will be authenticating and sending data to central servers, what is 'best' practice when it comes to sessions or authentication?</p>
  
  <ol>
  <li>does WCF support a session, if yes, should I use it?
  or should I simply pass username/password on a per call basis?</li>
  </ol>