http://developers.de/blogs/damir_dobric/archive/2010/03/19/userimpersonation-in-windowsforms-and-wpf.aspxFollowing example shows how to enforce interactive user in Windows Forms or WPF applications to become WindowsPrincipal, which can be read by Thread.CurrentPricipal :   // This is identity of the user interactivelly logged on.   WindowsIdentityenCommunityServer 2008 SP1 (Build: 30619.63)