This is something I randomly discovered when I upgraded my own burning crusade account.
It seems blizzard has a flaw in their php programming and their upgrading sessions aren't given an unique id.
Basically what happens is 2 accounts get upgraded with the same key, duping if you will =).
But in order to do this you need a special runtime environment and a linux server. For those who want to share
their account with a friend and want to be able to play at the same time, without disconnecting each other I can
make this happen by duping the account upgrade. Send an e-mail to danysystem@hotmail.fr with your cd-key.
Note that I am not trying to scam you as I do not want to know your account details. The key will be duped on an account
that I have, since I am able to bind an unlimitted number of cd-keys to this account, everybody will log in with
this account =) .
It is very important that you send an UNUSED cd-key, because if the key has been used in 1 account upgrade, it can
not be used in the process explained above because it has been uniquely attributed to the upgraded account to which
it belonged to . If you are afraid of losing your cd key please do not do this. Even so however you can send an e-mail
to blizzard support with your account details e-mail and contact information to retrieve the account details or key.
Since I will probably be getting lots of e-mails I do not guarantee immediate upgrade, so wait 1 day or so.If you
have questions , please feel free to adress them to the same e-mail adress. Thank you for reading.
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