If it is pointed out that a suspected user using some name other than the one he or she originally registered with, therefore has re-registered with this other name, providing forum admin has access to IP addresses the address will match. If it is forum policy to not allow this sort of thing then admin can do whatever is in the forum rules, which may include banning the member in either of the guises.
Edit to add, now I have re-read the rules.
Rule 11 covers this, so it is up to admin to sort it out if they are informed through the proper channels.

Last edited by Cornet Nev; 10/13/12 01:22 PM.