Library /sys$common/syshlp/dtm$dw_helplib.hlb overview, run  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Before you can execute tests, you must make them a
  part of a collection. Then you can execute the tests in
  batch mode or interactively as part of the collections.

  A collection is a "snapshot" of the specified test
  descriptions and their related files at the time the
  collection is created, Therefore, you must re-create
  the collection if you change a test description, group,
  or their contents.

  Additional Information (explode) :

• cre_coll
• recre_coll
• del_colls
• exec_tests
• test_steps
• stop_coll