The printer I have that duplexes is an inkjet, which I use only rarely, when
I have to print in color (usually just single pages), and the only time I've
ever used the duplex feature was in printing a proof of a brochure I was
creating for a client. Almost all my work is done on a LaserJet that doesn't
duplex, and I duplex (when necessary) totally manually (without confusing
assistance from Word). But I have little need to duplex, and then usually
only a couple of pages. Perhaps if I'd had more need to duplex I might have
bothered to figure out what those settings meant, but I appreciate your
doing the work for me!