Syntax:  FOCUS

  Displays an overview of the buffer around the current position.

  This command displays the current line and its surrounding text.  The
  rest of the lines in the buffer are collapsed as much as possible and
  represented by overview lines.

  The editor determines the relative level of detail of a line by
  comparing the indentation of the line with the indentation of other
  lines.  The editor's treatment of the indentation of a line is
  influenced by indentation adjustment definitions.  For more
  information, see the SET ADJUSTMENT commands.