OPC UA includes support for security audit trails with traceability between Client and Server audit logs. If a security-related problem is detected at the Server, the associated Client audit log entry can be located and examined. OPC UA also provides the capability for Servers to generate Event Notifications that report auditable Events to Clients capable of processing and logging them. OPC UA defines security audit parameters that can be included in audit log entries and in audit Event Notifications. OPC 10000-5 defines the data types for these parameters. Not all Servers and Clients provide all of the auditing features. Profiles, found in OPC 10000-7, indicate which features are supported.