http://blogs.technet.com/b/tothesharepoint/archive/2012/10/09/new-sharepoint-2013-and-sharepoint-2010-claims-encoding-topic-in-the-technet-wiki.aspxThe SharePoint 2013 and SharePoint 2010 claims encoding topic is now available. Have you ever wondered what “i:0#.w|contoso\chris” (or something like it) meant in the display of user sign-in information on a SharePoint site or in Unifieden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)