As specified in the UA Auditing description in OPC 10000-4, OPC UA supports Audit logging by providing traceability of activities through the log entries of the multiple Clients and Servers that initiate, forward, and handle the activity. OPC UA depends upon OPC UA Application products to provide an effective Audit logging scheme or an efficient manner of collecting the Audit Events of all nodes. This scheme may be part of a larger industrial automation product of which the OPC UA Applications are a part.