This DD statement contains the messages issued by the command task running in the scheduler address space. During startup, important control block addresses, configuration parameters used, command exit names and the name of the command REXX exec are listed. The command task successfully initialized when this message is issued:
TAU0107I hh:mm:ss.ttt Registration for exception handler >>TAURIP86<< successful.
After startup, it will contain command responses for modify commands directed at the scheduler.