CVON
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  Purpose : Locally enable the processing of CodeView information

  Syntax  : CVON

  Default : Disabled

  The CVON command begins a CodeView area, and enables the processing of
  CodeView information from the point the command is encountered in the
  script until the next CVOFF command. The CodeView areas are used to
  limit the amount of overlaid code for which CodeView debugging is
  enabled.

  Due to the method used by Blinker to support debugging of dynamically
  overlaid code under CodeView, large overlaid applications will execute
  faster under the debugger if the amount of overlaid code containing
  debugging information is limited using these commands.

  Files, modules or libraries which are within a CodeView area will have
  all of their symbolic information recorded in the executable for use by
  the debugger. Files, modules or libraries which are not within a
  CodeView area will only have their public symbols and module boundaries
  recorded.

  FILE a,b,c
  BEGINAREA
      FILE d,e
      # begin CodeView area for files  f and g
      CVON
      FILE f,g
      # end CodeView area
      CVOFF
      LIB abc
      # begin CodeView area for XYZ.LIB
      CVON
      LIB xyz
      # end CodeView area
      CVOFF
  ENDAREA
  LIB funclib