Abstract: The Internet provides communication between a server and security officers, supervisors, client representatives, and a security system computer at a client site. On-line access to the server provides integration and management of security system functions such as maintenance of call lists and reports, shift management, and supervision of security officers. The use of the Internet for communication between the server and the client site computer not only provides faster and more reliable communication but also enables the client site computer to request the server to schedule a contingent future event including a need to service a call list unless the client site computer reports a condition warranting the removal of the contingent event from the schedule. For example, the failure of a security officer to visit a check point at a scheduled time results in the server accessing a call list to notify a designated recipient.