Master trace is a diagnostic aid that maintains a trace table of console messages in virtual storage. When master trace is active, the master trace table is embedded in dumps that have the TRT option or contain the master scheduler's private address space. Master trace can eliminate the need to submit a portion of the system log to IBM® if there are problems in message processing. It also can ensure that the messages accompanying a dump are the ones that correspond to the problem. The TRACE command controls master trace. For a more detailed description of master trace, see z/OS MVS Diagnosis: Tools and Service Aids.