Canon PIXMA MG4200 Series On-Screen Manual page 494

Even if IJ Network Scanner Selector EX does not launch automatically, you can print and
scan from a computer over network. However, you cannot forward scanned data to a
computer over network using the operation panel on the machine.
To launch IJ Network Scanner Selector EX automatically again, follow either of the
procedure below.
Click [+] in the step 3. Then click Applications > Canon Utilities > IJ Network
Scanner Selector EX, select Canon IJ Network Scanner Selector EX, and click Add.
Then restart your computer.
Select Preferences from the Canon IJ Network Scanner Selector EX menu, then
select the Enables scanning from the operation panel check box.
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