Choose the Play... menu item to replay an interactive
  terminal test or DECwindows test.

  The Play operation executes the specified session file.
  The file is not part of a collection and DTM does not
  compare the results.

  For terminal session files, DTM executes the session
  file as if it were being run on the same type of
  display device on which it was recorded. If the display
  device characteristics are different than those for the
  recording display device, the output may not appear as
  expected.