Get the special bard, Self. Object path of Self. The URI of the tunnel. The tunneled status changed. The new tunneled status. Get the tunneled status. Indicate the tunneled status. DEPRECATED. DEPRECATED. Add a viewport to the world. The minimal longitude of the viewport. The minimal latitude of the viewport. The maximal longitude of the viewport. The maximal latitude of the viewport. The object path of the newly added viewport. Remove a viewport from the world. The object path of the viewport to be removed. Add a tag to the world. The longitude of the tag. The latitude of the tag. The description of the tag. The object path of the newly added tag. Remove a tag from the world. The object path of the tag to be removed. Take a snapshot of the world. It usually means saving current status to the filesystem.