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$FrontEnd

$FrontEnd
is a global variable that specifies to what front end object, if any, the kernel is currently connected.

You can use Options and SetOptions on $FrontEnd to read and set global options for the front end.

Options set for $FrontEnd are by default stored in the front end init.m file, and are persistent between front end sessions.

Typical value when using the Notebook interface:

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