Administration involves more than creating and modifying elements. It can include monitoring a system and informing an operator when a queue is full, or dealing with an error situation, for example taking appropriate action when a message arrives that is too large for its target queue. MQe handles these aspects using rules, whenever elements significantly change their status or when certain types of error situations arise. MQe provides a default rule implementation, which users can customize if they wish. See Customizing rules for more information on this.