Oki C 5400n - Manual (Page 246)

Windows: Postscript Emulation Driver • 244
4. On the Layout tab, under Pages Per Sheet , select Booklet .
5. Select Portrait or Landscape under Orientation .
6. Make sure Flip on Long Edge is selected under Print on Both
Sides(Duplex) .
7. Select the desired Page Order .
8. Windows XP only: click OK to return to the Print dialog box.
9. Click Print .