NT is a somewhat generic term that can refer to either the Windows NT series 3 51 4 0 2000 XP etc or to specific versions that used NT in the product name pretty much just 3 51 and 4 0 NT 3 51 and 4 0 were based on UCS 2 It would probably be more accurate to leave the NT out entirely since the 2000 and XP stand on their own not to mention that NT does not apply to CE