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I'm pretty sure the original Everquest used UDP. I remember during beta a friend of mine would log into my account while I was still logged in, I could click on buttons to start elevators and such, and he could see the elevators move when I did that. With TCP, my connection would have been dropped and I wouldn't have been able to do that.

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No that's not right. Both TCP and UDP are single source single destination formats. Eg, they both have a definite IP/port specified in their headers. A packet sent directly to your friend cannot get to you or vice versa. So what you experienced was simply the Everquest server sending the same duplicate information to both you and your friends, which could be done with both UDP and TCP.

Not sure about EQ, but I'm almost positive UO did. I remember having to set up port forwarding on our home router.

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