Oce 1010N - B/W Laser Printer Operation Manual page 98

Printing from Windows Applications
To print on both sides of paper
1
Display the printer driver's Properties dialog box from the
application software.
2
Select either the printer's paper cassette or option paper feeder, if
installed, from the Source list box.
3
Click the Layout tab.
4
Select the Print on Both Sides (Manual Duplex) check box.
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