code: function(service) {
  
  		// If the service doesn't exist
  		service = service || this.settings.default_service;
  
  		if (!service || !(service in this.services)) {
  			return null;
  		}
  
  		return this.utils.store(service) || null;
  	}
docs: Returns all the sessions that are subscribed too @param string optional, name of the service to get information about.