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 Preview          Make a preview of the print work
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 Syntax:          <oPrn>:Preview()

 Parameters:      None

 Returns:         nil

 Comments:        This method invokes the preview mode, which displays
                  a window with a buttonbar, a visual page/s, to interactively
                  let the user preview the print work and optionally to
                  select what pages to finally send to the printer.