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Can I tell if two people off different e-mail addresses on MSN Messenger are the same person? - msn addresses

Is there a way to tell whether two people to other e-mail addresses are actually the same person, in MSN Messenger? Considered For example, one way to find any IP \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ 's have another thing to show whether they were from the same PC (I and 2 can Messengers on the same PC open)