Assuming I am accounting for 32-bit and 64-bit DVDs, can I use a Windows 7 Ultimate DVD for lower editions of Windows 7 (E.G: Home Basic, Pro, etc...)? I kind of answered my question on this as it seemed to have worked but I wanted to know if the DVDs that come with other editions are the exact same. I want to mention that these are retail DVDs and not ones that come from a manufacturer.
Also, is the same thing true for Windows Vista DVDs. I assume that the same is not true for Windows XP.