The hardware Windows button was only mandated with Windows 8, so earlier devices may not have it. And even though I do have three buttons on my convertible laptop that can be customized in control panel's tablet PC settings that I could assign to the Windows key, or Shift+Win, that's not working right because it doesn't work when an elevated process window is focused. Additionally, binding the Windows key to the start screen would apply to hardware keyboards and the on-screen keyboard as well, where I don't see the start screen as a preferable option.
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