VMS Help DTM, MODIFY, TEST_DESCRIPTION, Command Qualifiers, /PROLOGUE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   /PROLOGUE=file-specification
   /NOPROLOGUE

   Specifies whether the test prologue file should be replaced or
   disassociated from the test description.

   The /PROLOGUE qualifier adds the specified test prologue file
   specification to the test description. The test prologue is run
   whenever the test description is run and does not affect any
   collection prologue run with the test. The /NOPROLOGUE qualifier
   removes the current test prologue file specification from the test
   description.