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

  A DCL symbol or logical name that is defined only while
  the test with which it is associated is running. Local
  variables can be used by the prologue, template, and
  epilogue files associated with this test.