This is an old tricks. It's also the last function of " ı " special character that haven't banned yet. You can create the back room without entering the room even the full room. The way is : Choose Create Room >> type the new room name >> Create, for example indochinese, one of the " i " change into " ı " special character.
1. It's only for the room with i character.
2. The Nicks that make the back room by using this tricks will be left for the moments in the back room although our nick have already leave, so if there's another nick who made the back room with this tricks, it will be appeared our nick which left [it is not used to make back room with another way