Through the ATBTRACE REXX exec, you may request a list of all active API traces for a particular data set, or for all API trace data sets on the system. When it successfully processes a LIST request, APPC/MVS returns message ATB60046I to the issuer of the request; this message contains:

• A user ID and time stamp to indicate who issued the first START request for this data set, and at what date and time.
• For each active trace, the parameter values that were specified on the START request, and the date and time at which the START request was issued.

Because an unlimited number of traces may be active for each trace data set, you might have difficulty finding the end of the list. Look for message ATB60042I, which APPC/MVS returns when LIST processing is complete.

APPC/MVS does not return LIST information for a data set for which STOP processing is in progress. Depending on the type of LIST request you specify (one data set or all), APPC/MVS returns message ATB60047I when STOP processing is in progress:

• If you specified one data set, you get only ATB60047I in response
• If you specified all, you get the same message for each data set for which STOP processing is in progress, along with the list of active traces for the remaining trace data sets on the system.