3.2.1 Abstract Data Model
ActivityId: When a request is sent by a client and Correlation Mode is enabled, the client inserts a SOAP ActivityId Header Block that includes an ActivityId. This value is stored and used in messages that are part of a correlated set.
Correlation Mode: A Boolean value. When set to TRUE, Correlation Mode is enabled; the client is configured to participate in correlated tracing. It sends the appropriate ActivityId for the correlated set the current message is a part of. If set to FALSE, Correlation Mode is disabled and the ActivityId is not inserted.