This invention relates to a fastener system, in particular a system for improving computer room security that reduces energy consumption. The fastener system comprises a fastener for fastening a first element to a second element and a sensor of any suitable form and means for activating a third element in response to a signal generated from said sensor. The sensor sends a signal that prompts the third element to act in response to the status received from the fastener. This invention is particularly useful within server racks.