Identical nicknames on eMule

[abel]

Few instants ago looking at my upload I have noticed that somebody named abel downloads something from my shared files. I am a bit confused and concerned, how it is possible, I believed that the chosen nickname in eMule is unique, like when one creates an e-mail account. Apparently it is not the case, ok, but I am afraid of any kind of confusion. Is it possible to distinguish two people having identical nick on eMule?