The API trace facility produces:

• Return codes to indicate successful or unsuccessful processing of an ATBTRACE START, STOP, or LIST request
• Status or error messages to provide additional information to issuers of START, STOP, or LIST requests
• Trace data in the form of ATB6xxxxI messages.

The following sections provide details about return codes and status or error messages; API Trace Facility Messages describes all of the messages for the API trace facility.