Brother MFC-3420C - Manual (Page 177)

USING YOUR MACHINE WITH A MACINTOSH ® 9 - 22
Print
This command prints the selected items on the machine. You cannot
print the data until it is uploaded to the machine. Click Apply to
upload the new data to the machine and click Print.
Export
This command saves the current configuration settings to a file.
Import
This command reads the settings from a file.