Got a Macbook Pro and an HP 2055dn printer that's networked via ethernet connection to a LAN that has two other computers on it, an XP and a WIN7 machine. I added the printer to the the MacBook pro, and can print from every program, but the only program that gives me a check box for "two sided" or duplex printing, is Firefox. MSWord doesn't offer that choice and neither does Adobe Acrobat, only Firefox let's me duplex. I can duplex from both the XP and wIN& machines on all programs. What did I forget to set on the MacBook Pro?