Prologue files and epilogue files enable you to control
  the DTM test environment. Both are command files that
  you create and associate with tests and collections.

  You use prologue files to set up test conditions before
  recording a test, running a test in a collection, or
  executing the collection as a whole. You use epilogue
  files to clean up or filter files after recording a
  test, running a test in a collection, or executing the
  collection as a whole.

  Tests, prologue files, and epilogue files execute in
  the following order:

  1. Collection prologue file

  2. Test1 prologue file

  3. Test1

  4. Test1 epilogue file

  5. Test2 prologue file

  6. Test2

  7. Test2 epilogue file
         .
         .
         .

  8. Collection epilogue file