During SMP/E processing, messages recording what has occurred are written to SMPOUT. Critical messages are also written to the SMPLOG data set to provide a permanent record of processing. Still other messages are written to SMPLOG to record internal processing, such as updating a SYSMOD entry or deleting an MTSMAC entry. In addition to the messages written by SMP/E, you may want to store messages in the SMPLOG, such as why a SYSMOD is being installed and who is installing it. You can do this using the LOG command.