Do to the changes to WinLogon and the LogonUI in Windows Server 2008, XENapp 5.0 clients display the Logoff UI in XENAPP seamless sessions.. Find out how to make it go away.
Once you have implemented the script, the terminal server will disconnect the session when the user logs off (Which simply hides the UI from the end user. If you do create this logoff script, be sure to ensure that your logoffs are happening clean, in some scenarios, a hung process will keep the session open without giving any notification to the user.
More information: http://support.microsoft.com/kb/321705
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