I ran a random dungeon today with someone I enjoyed playing the game with. I asked if he wanted to be friends, and he agreed. I kept trying to add him as a friend but because he was from a different server, I kept getting the error message "Player not found" before I could ask for his email for RealID, he left the instance.
I know people can add RealID in-game, even cross faction (Alliance players have invited me as friends when I saw them out in the wild, on a PvP server to talk to me) so how do I do this? What command is it?