Prohibit closing items
User Configuration\AdministrativeTemplates\Desktop\Active Desktop
Prevents users from removing Web content from their Active Desktop.
In Active Desktop, you can add items to the desktop, but close them so they are not displayed. If you enable this policy, items added to the desktop cannot be closed; they always appear on the desktop.
This policy removes the list of the Active Desktop items from the Active Desktop menu. (To see this list, right-click the desktop and point to Active Desktop. The list appears at the bottom of the menu.) Also, it removes the check boxes from items on the Web tab in Display in Control Panel.
This policy does not prevent users from deleting items from their Active Desktop.