Dan Kachoogian It was as close to feeling totally natural to
  work with as any language. I always felt that *that* is what
  MS-DOS should have behaved like. I especially loved -
  built-in-versioning! the ;1 ;2 ;3 ;4 ;5.... taught me well. the
  Future Ken knew to always "save_as" and embed the current
  date/time IN the filename... as a form of versioning. And I
  thank DEC for that."