Re: does this fix anything?
>concurrent users or named users - the former would be equivalent to RDS (terminal services) licencing
Pretty sure that's not correct, RDS CALs are for a named user.
>BUT what's this diagonal screen size thing? A Tablet whatever the size of screen is either going to with Windows installed or it's not (and probably licenced)
It's Windows Enterprise, it's pretty much only available as an upgrade. They are assuming that under 10" screen either already comes with Windows installed or if not, it isn't worth worrying about. Over 10" and you are getting into something that might reasonably replace a desktop and may not have come with Windows pre-loaded, they want to pay for an eligible license to upgrade to Enterprise.