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 HlpDef          Defines the help system parameters.
 HlpOff          Undefine Help
 HlpKey          Define or Undefine Help Key
 HlpTtl          Define new help-window title, replacing "  Help  ".
 HlpWind         Define a new help window.
 HlpGet          Display the current help screen.
 HlpAdd          Push current help category, then set help category.
 HlpCur          Push current help category.
 HlpDrop         Drop last pushed help category.
 HlpSet          Set help category.
 HlpPush         Push help category onto help-stack.
 HlpPop          Pop help category off stack and make current.
 HlpAct          Test whether help has been defined.
 HlpClr          Clears the help category stack
 _HlpErr         Display "not found" message in help window and wait
 _HlpPag         Display help-category with paging, cross-references, etc.