IG_PDF_DUPLEX_OFF

0x0000

Respect whatever duplex option was selected in printer preferences.

IG_PDF_DUPLEX_ON_TUMBLE_SHORT

0x0001

Specify Duplex mode, tumbling on the short axis of the page (e.g., tablet-style).

IG_PDF_DUPLEX_ON_TUMBLE_LONG

0x0002

Specify Duplex mode, tumbling on the long axis of the page (e.g., Portrait book-style).

IG_PDF_DUPLEX_FORCE_SIMPLEX

0x0003

Force simplex printing, ignoring the printer preferences.