6. A system comprising: an interface circuit interfacing to a plurality of security sensor types distributed throughout a plurality of sites, each sensor type configured to respond to a corresponding type of actionable event, each sensor type provided by a different manufacturer of a plurality of manufacturers; an integration circuit including a processing agent for each type of security sensor to accept sensor data from each security sensor in a native data representation format of each respective manufacturer of the plurality of manufacturers; a central security management processor coupled to the integration circuit and configured to manage individual user profiles and their respective access privileges and credentials in the system; a normalization circuit mapping the sensor data from each security sensor in the native data representation format of each manufacturer of the plurality of manufacturers to a common data representation format, the common data representation format including a data object and processing information for the sensor data, the normalization circuit further configured to generate unique physical access privileges and credentials to exclusively map a user's profile to a spatial hierarchy of physical sites along with security devices of the system, wherein the unique physical access credentials maintain a common representation of the user's identity across the plurality of sites and to associate specific user identities with respective actionable events; a visual policy manager circuit defining, at design time, physical security policies in the context of user profiles at all sites through actionable representations of physical, network and information technology resources of the sites, wherein the security policies define standardized rule definitions through visual rules depicted by live objects that contain attributes to define their spatial relationship to the actionable representations, and that are applied to the actionable events normalized to the common data representation format to produce normalized event data; and a signal processing circuit receiving the normalized event data and applying, at run time, relevant transformation and routing rules comprising condition-action sequences in order to maintain user profiles and physical security states across the plurality of sites and to resolve the actionable events through the associated specific user identities.
6. A system comprising: an interface circuit interfacing to a plurality of security sensor types distributed throughout a plurality of sites, each sensor type configured to respond to a corresponding type of actionable event, each sensor type provided by a different manufacturer of a plurality of manufacturers; an integration circuit including a processing agent for each type of security sensor to accept sensor data from each security sensor in a native data representation format of each respective manufacturer of the plurality of manufacturers; a central security management processor coupled to the integration circuit and configured to manage individual user profiles and their respective access privileges and credentials in the system; a normalization circuit mapping the sensor data from each security sensor in the native data representation format of each manufacturer of the plurality of manufacturers to a common data representation format, the common data representation format including a data object and processing information for the sensor data, the normalization circuit further configured to generate unique physical access privileges and credentials to exclusively map a user's profile to a spatial hierarchy of physical sites along with security devices of the system, wherein the unique physical access credentials maintain a common representation of the user's identity across the plurality of sites and to associate specific user identities with respective actionable events; a visual policy manager circuit defining, at design time, physical security policies in the context of user profiles at all sites through actionable representations of physical, network and information technology resources of the sites, wherein the security policies define standardized rule definitions through visual rules depicted by live objects that contain attributes to define their spatial relationship to the actionable representations, and that are applied to the actionable events normalized to the common data representation format to produce normalized event data; and a signal processing circuit receiving the normalized event data and applying, at run time, relevant transformation and routing rules comprising condition-action sequences in order to maintain user profiles and physical security states across the plurality of sites and to resolve the actionable events through the associated specific user identities. 7. The system of claim 6 wherein the plurality of sensor types comprise physical access, intrusion, and environmental conditions, and wherein the action events comprise at least one of generating an audible alarm, notifying authority personnel, initiating lockdown mode of the site, initiating computer backup and shutdown procedures, and facilitating exit from the site.