Usage       : .private
Description : Sets a rooms access status to private, prohibiting anyone 
              from entering without an invitation. Anti-social behaviour is 
              frowned upon, so there must be at least two people in the 
              room to use .private. If the number of occupants drops 
              below 2, the room goes public. Rooms that serve as connections 
              between others cannot be set to private, as you can trap 
              people behind you.
