I've just added BBC iPlayer to the iPad home screen and noticed something surprising. When I press the home screen icon, it does not open a new window in Safari. Instead it opens as a 'standalone' app with no title bar. Obviously some (but not all) web apps/pages can open their own independent instance of Safari after they have been saved to the home screen, instead of just opening a window in 'main' Safari. I've googled but found no mention of this. Can anyone tell me more about this feature? Does it have to be enabled by the developer?