A user-defined OpenVMS symbol or logical name.

  DTM stores variables in its library for use when it
  executes tests. There are two types of variables:

  Global    Once created, global variables are accessible
            by any test in all collections if the
            test's template, prologue, or epilogue file
            references the variable.
  Local     Local variables are accessible only to a
            single test if the variable is referenced in
            the test's template, prologue, or epilogue
            file.