GP has been around since Windows 2000, i think. Earlier it had more to do with server based environments, but at least since xp pro, GP is also very useful to manage small networks like a home or small work network. On a single, stand alone computer with multiple users, Group Policy can be put to good use. Even otherwise, it can be used to manage many changes that are implemented in the registry. IDK what version of Windows 7 you have but GP Editor will only be available in the Windows 7 Professional, Ultimate, and Enterpise editions.