When you execute a test collection, DTM sets up the
  test environment and executes all the tests in the
  collection. Each test in a collection generates a
  separate result file, which contains the output
  generated by the template file.

  DTM automatically compares the result file to a
  test's benchmark file and logs any discrepancies in a
  difference file. After DTM compares the collection, you
  can view test results using DTM's Review and Display
  functions.

  To execute an existing collection, perform the
  following steps:

  1. Create a Collection view.

  2. Click on (highlight) the collection you want to
     execute.

  3. Pull down the Testing menu.

  4. Choose the Submit... or Run... menu item.

  The Submit... menu item enables you to execute the
  selected collection in batch mode; the Run... menu item
  enables you to execute the collection interactively.