activation generates a unique ID based on the product key and hardware components, which M$ keeps in a database. if a copy has been activated on one machine, other activations will be denied.
http://support.microsoft.com/kb/302878
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Until the 20th century, reality was everything humans could touch, smell, see, and hear. Since the initial publication of the charted electromagnetic spectrum, humans have learned that what they can touch, smell, see, and hear is less than one millionth of reality
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