You create prologue and epilogue files with a text
  editor. You must then identify the files to DTM.

  You can specify default collection prologue and
  epilogue files. All subsequently created collections
  invoke this file whenever DTM executes the collections.

  You can override the default specifications by
  explicitly specifying a different collection prologue
  or epilogue file when you create the collection. When
  you override the default collection prologue and
  epilogue files, you do so only for the newly created
  collection.