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.

1  –  cre_vars

  To create global and local variables, perform the
  following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Create menu item and the Variable...
     submenu item.

  The Variable dialog box enables you to specify the
  value, scope, use, and type of variable.

  All tests can use global variables. However, you
  must explicitly associate local variables with a test
  description.

1.1  –  ass_lvar

  To assign a previously defined local variable to an
  existing test or to a test that you are creating,
  perform the following steps:

  1. From the Test View, click on the test to be
     modified.

  2. Pull down the Maintenance menu.

  3. Choose the Modify menu item and the Test... submenu
     item.

  4. Click the Variables button

  5. Enter the local variable into the Variables field.

  If you are creating a test, enter the local variable
  into the Variables field.

2  –  vue_vars

  To change the active view window to an unrestricted
  variable view, perform the following steps:

  1. Pull down the View menu.

  2. Choose the Variable... menu item.

  To create a new view window displaying variables,
  perform the following steps:

  1. Pull down the View menu.

  2. Choose the New menu item and the Variable submenu
     item.

3  –  mod_vars

  To modify current default variables in the DTM library,
  perform the following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Modify menu item and the Variable...
     submenu item.

4  –  over_vars

  To override a default variable for an existing test,
  perform the following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Modify menu item and the Test... submenu
     item.

  3. Click on the Options... button.

  Most tests use a variable's default value. For tests
  that require special handling or special variable
  values, you can override existing variables.

  You can also override a variable's default value when
  you create the test by clicking on the Options...
  button in the Create Test dialog box, then entering
  the variable and a replacement value into the Variables
  field.

  You can override a global variable for a collection
  when you create the collection by clicking on the
  Options... button in the Create Collection dialog box.

5  –  del_vars

  To delete a variable from the DTM library, perform the
  following steps:

  1. Pull down the Maintenance menu.

  2. Choose the Delete menu item and the Variable...
     submenu item.

6  –  control_vars

  The following logical variables can be used to control
  the behavior of certain commands. They are fully
  described in the manual Guide to DIGITAL Test Manager
  for OpenVMS Systems or in the product Release Notes.

  o  DTM$DATE_FILTER_FIRST

  o  DTM$DATE_FILTER_MAX_YEAR

  o  DTM$DATE_FILTER_MIN_YEAR

  o  DTM$DATE_FILTER_STRING

  o  DTM$DATE_MASK_MAX_YEAR

  o  DTM$DATE_MASK_MIN_YEAR

  o  DTM$DELAY_TIMEOUT

  o  DTM$IGNORE_PROLOGUE_ERRORS

  o  DTM$OMIT_PRINTABLE_SCREENS

  o  DTM$RETAIN_RESULTS

  o  DTM$TIME_FILTER_NO_SPACE