I thought help_dialog_mode might have been it, but this is what the online manual says about it:
Quote:
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Sets whether the in-game help opens using the in-game browser, or your computer's default browser. (Values: 0=OOTP browser 1=external browser) This value can also be changed from the Game Preferences screen.
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It's curious they would name it that instead of something like browser_mode though.