NoTrayItemsDisplay
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Stores configuration data for the policy setting Hide the notification area.
To change the value of this entry, use the Group Policy Object Editor (Gpedit.msc). The corresponding policy is located in Administrative Templates\Start Menu and Taskbar.