have a couple of questions... Firstly, can a royalty key be used on more than 1 computer at any 1 time or microsoft will know? Secondly, does every royalty OEM discs ship with a different royalty key? or a certain batch have the same royalty key? Thirdly, How do you recgonize a royalty key from a COA key? is there any way to tell other then trying them all?? Finally, just to confirm, royalty cd keys are still product specific right ( Home/Pro/ WMC etc..) ? Thanks!