User:Tisane/User name collisions

When you try to create a user name on the local wiki, it checks existence on the remote wiki.
 * If it doesn't exist there, you are good to go. However, your user name can later be co-opted by a new user on the remote wiki, in which case you lose access until you prove that you are one and the same as that user.
 * If it does exist there already, you cannot create that account until you prove you are the same user.