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