Validity of a XP Pro license

I have a unused (I think anyway) XP Pro license and I want to give to a friend.

How can I make sure it's an unused license?
I can input key somewhere and Microsoft could tell me whether or not it is a valid and usable license?

The operating system must be upward and running to test for Validation.

As you will appreciate, there is no list available of product keys is not used/Used accessible to the Public.

See you soon. Mick Murphy - Microsoft partner

Tags: Windows

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