PCAA> PLOT/SOURCE PROGRAM BY LINE
  PCAA> PAGE 16

      The PLOT command generates a histogram and displays page 1 of
      that histogram. The PAGE command then displays page 16 of the
      same histogram.

  PCAA> PAGE PREVIOUS

      This command displays the previous page of the currently active
      plot. If the current page is page 16, this command displays
      page 15.

  PCAA> PAGE SUMMARY

      This command displays the first summary page of the currently
      active plot.