CSops or operators with the appropriate flag (CFORCEREG) can register a room without having op status in the room. Note: Root admins can register a room without being in it at the time.
Example:
/msg chanserv register #webnet WebPass General Chat
This is another command to allow you to take control of a room. It is rarely needed, but if an unregistered room is causing problems, you can register it and take control.