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How can I select buttons with just the keyboard?

I have been using OS X for only a while now and am finding certain things a bit hard to do. Consider an option box shown below :- enter image description here

Pressing an enter key would shut down the system, however how do I select the "restart" or the "cancel" options using they keyboard alone? Whats the keyboard shortcut for that? Arrow keys just dont work. Coming from a Linux/Windows background, this is really confusing.

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marked as duplicate by mankoff, Robert S Ciaccio Feb 14 '11 at 4:16

This question was marked as an exact duplicate of an existing question.

What suggested in How can I approve prompts with just the keyboard? doesn't work. – kiamlaluno Feb 13 '11 at 20:29
Use the solution @mankoff provided on… and it will work. You need to enable it in the keyboard settings – conorgriffin Feb 13 '11 at 20:36
This is called a dialog box, or simply a dialog. – Nicolas Barbulesco Jan 31 '15 at 17:45
up vote -1 down vote accepted

Use the Tab key to switch buttons then return to activate that.

I think all GUIS I have used - Windows, OSX, X11, old Mac all have this

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Don't try this at home ! You would risk shutting down your Mac by mistake. This answer is simply wrong. – Nicolas Barbulesco Jan 31 '15 at 17:48
How does that shutdown a Mac? – Mark Jan 31 '15 at 19:39
Let's say Joe has full keyboard access enabled. Joe presses the Power button, and gets the dialog. Joe follows your advice, and presses Tab until the button Cancel is outlined, and presses Return to activate the button Cancel. This will activate the default button Shut down, and will shut down the Mac. – Nicolas Barbulesco Feb 1 '15 at 16:11

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