Oce im2330 Printing Manual page 224

5 Printing from Windows
When this option is enabled as well as the "Use Front Cover" and "Use Back Cover" options
enabled, no page is inserted after the front cover and back cover.
Source
Select the location from where the interleaving sheet is to be fed. When "Automatic" is
selected, the paper is automatically selected according to the printed document size.
The selectable values in the Source drop down box vary depending on the optional devices
installed on this equipment and their configuration on the Configuration tab.
Duplicate
When you check on this, you can print previous page images on the inserted sheet.
222 Setting Up Print Options