How to Hide the Screen Saver Settings Page? - This option hides the screen saver page from the display settings control, which stops users having access to change screen saver settings.
How to Hide the Themes Settings Page? - This option hides the Themes tab which prevents the user from selecting an alternate theme. Themes normally include a background plus sounds, icons and other elements.
How to Hide the Keyboard Navigation Settings? - This restriction disables the "Hide keyboard navigation indicators until I use the ALT key" option in the Display Control Panel (see Appearance->Effects).
How to Force the Background Image and Wallpaper Style ? - These settings allow you to specify the background wallpaper and display style. When this setting is defined users can not choose an alternative background image in the Display Properties. Note that this restriction does not force Windows to show selected wallpaper image on the screen. When whis option is on, users can not just change wallpaper image using Display Properties. If you need to use desired wallpaper, select it in the Display Properties, first!