Brother HL-3450CN - Manual (Page 39)

CHAPTER 2 DRIVER AND SOFTWARE
2-5
DUPLEX
To use duplex printing, you will need to install the optional Duplex unit onto
your printer. If you select the duplex button, the dialogue box for duplex
settings will appear. Six types of duplex binding directions are available for
each orientation.
WATERMARK
You can place a watermarked logo or text in your documents.
When you use a bitmap file as a watermark, you can change the size of the
watermark and place it anywhere you like on the page.
When you use text as a watermark, you can change the font, darkness and
angle settings.
PAGE SETUP
Change the print image scaling, and then select Mirror / Reverse print
options.