Mac OS X
The following functions are selectable under Mac OS X 10.3 or higher (for Mac OS X 10.2 or earlier, see Windows 2000/XP/Vista, Windows Server2003/2003 R2/2008, Mac OS in Duplex Printing)
Off
Disables Duplex Printing.
Long-Edge Binding
Prints output so that you can open it to the long edge when bound along the long edge.
Short-Edge Binding
Prints output so that you can open it to the short edge when bound along the short edge.
