NationStates Jolt Archive

Me and my brother both like NationStates. We both use the same computer but have 2 different e-mails. Is it possible for us to both be in the UN, or can only one of us. Do they check it by the IP Adress, or by the e-mail.
Thanks

If you're both using the same computer, make sure only one of you has a UN nation, or share a UN nation.