Which Windows 7 product key did I use?

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Joined
18 Oct 2002
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322
Location
North London, UK
A couple of months ago I installed 3 of my PCs with Windows 7 professional.

On one of these PCs I would like to install a second copy of Windows 7 to a separate partition (for gaming).

I assume I should use the same product key as currently installed on the other partition.

However, I can't remember which of my 3 product keys I used on this PC.

What should I do?

Can I identify which PC used which key? I'd only need eg the last 4 digits.

Or could I change each PC to use a specific key (this time, I'd make a note), I don't want to have to reinstall all 3 PC's again.
 
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