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

  You can create both global and local variables,
  depending on the needs of your tests.

  Digital Test Manager defines all global variables
  in the current Digital Test Manager library at the
  beginning of every test recording or collection run.
  Digital Test Manager defines local variables only
  while the test with which they are associated is being
  recorded or run.

  Digital Test Manager also supplies built-in variables.

  You can use both the variables you add to the Digital
  Test Manager library and Digital Test Manager's
  built-in variables in a test's template, prologue,
  or epilogue file. You can use global variables in
  collection prologue and epilogue files.

  Additional Information (explode) :

• cre_vars
• vue_vars
• mod_vars
• over_vars
• del_vars
• control_vars