ABSTRACT
The building exterior often being the first line of defense, the most common entry points are doors and windows. Many security features help identify an intrusion, such as alarms and closed-circuit television (CCTV) systems. Without good locks, your alarm system will let you know when there is an intrusion and the CCTV will record the intruders taking your stuff. Locks and access control systems should allow authorized users while refusing unauthorized users. Proper systems should not let the unauthorized in or keep out authorized users.
