If you play more than one character, that's fine. There's nothing wrong with that. We are, however, very opposed to those characters interacting with, and benefiting each other.

This means that there can be no exchange of loot between characters. You cannot metagame information learned by one character, for the sake of another. There can be no discussions between characters. Your characters cannot be logged in at the same time, for any reason. If you do anything with one character that affects the other in any way at all, you are treading on dangerous ground, and you should stop immediately, and find a DM if the situation merits it.

All of this is considered cheating, which will not be tolerated on EfU.