PAGEORDER=value

      Specifies the order in which pages appear on a sheet.
      This can be thought of as the reading order of the pages.
      You must supply one of the following values to PAGEORDER:

      RightDown      Pages ordered left to right, top to bottom
      LeftDown       Pages ordered right to left, top to bottom
      RightUp        Pages ordered left to right, bottom to top
      LeftUp         Pages ordered right to left, bottom to top
      DownRight      Pages ordered top to bottom, left to right
      DownLeft       Pages ordered top to bottom, right to left
      UpRight        Pages ordered bottom to top, left to right
      UpLeft         Pages ordered bottom to top, right to left