Library /sys$common/syshlp/CMS$DW_HELP.HLB  —  M  M_M, Del  Dh mi, Dh db, Dh of
  The output file directs CMS to write the history output
  you are deleting to the specified file.  If you do not
  supply a file specification for the file, CMS creates a
  file named HISTORY.DMP and places it in your default
  directory.
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