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The one that is closest to you acts as a "Back" button; and the one towards the front acts as a "Forward" button as you would use to navigate between pages or multiple selections - very useful!
Sorry, there was a problem. Please try again later.You need to read the book again, with your glasses clean, because it's all in there. Those 2 buttons help navigation, like a page back, or page forward. Different programs will use them in a different context, for different things. You're Welcme.
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