Brother MFC-8420 User Manual page 310

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From application software such as Presto! PageManager ,
click File menu and select Print. Click Print to start printing.
If you want to change Copies, Pages, Resolution, Paper Source
and Media Type, select your settings before clicking Print.
Device Options allows you to select Duplex.
Automatic Duplex is only available with the MFC-8820D.
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USING YOUR MFC WITH A MACINTOSH 18 - 3