Refers to the ability to print on both sides of a page. This is managed by the printer by ordering the pages in the print queue so that only alternate pages are printed first. After the first print cycle, the pages are inverted and printed on the reverse.

In automatic duplex printing, the printer manages all the steps without requiring user intervention. In manual duplex printing, after the first print cycle, the user must reinsert the pages in the paper tray.

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