 about 
  the report before printing the first page, if you select this, you can use the 
  <b>pagecount</b> function to obtain the total number of pager of the report. 
  If this option is set, the report will be calculated entirely, then printed. 
  It can consume more system resources and the preview is slower because the entire 
  report is calculated before the engine show the first page.</p>
<p><strong>Duplex and paper source</strong> is implemented only for Microsoft 
  Windows, allow the selection o