1.  DTM> SET PROLOGUE DUA0:[USER01.DTMPRO]PROLOGUE.COM ""
       %DTM-S-NEWDEF, DUA0:[USER01.DTMPRO]prologue.com is the new default
       collection prologue.
       DTM>

   This example specifies a default collection prologue file.

   2.  DTM> SET NOPROLOGUE "canceling prologue"
       DTM-S-DEFCANCEL, Default prologue canceled
       DTM>

   This example cancels a default collection prologue file.