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

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

  DTM also supplies built-in variables.

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