from these articles it seems that two computers cannot use the same key at the same time.
I have two computers one xp one 7, I want to upgrade the xp to a 7 using the key from other computer, is this possible?
yes. But it's against the t&c and possibly unlawful - the reason I am writing is this so that u know that what is being discussed is shtick so don't go around thinking this is an official answer. Vehamaskil yavin
Some ppl have written the they walked into a best buy and copied the code off the sicker on the shelf models