from the XP home EULA:
Quote:
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1.1 Installation and use. You may install, use, access, display and run one copy of the Software on a single computer, such as a workstation, terminal or other device ("Workstation Computer"). The Software may not be used by more than one processor at any one time on any single Workstation Computer.
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same goes for Pro, except it allows for the use of two processors on the same computer (where each core counts as a processor? not sure on that)