i don't know what it stands for eather, but what it is, is a manufactors copy of XP (dell for instance) gets OEM versions, then they modify it to have the manufactor stuff on it, then put it on their computers. i baught 2 OEM versions for a website and they said dell manufactor disk, but they didn't have the dell stuff on them yet, because dell didn't modify them.
i would like all 3 copies. do u have a paypal account? thats the way i would like to pay