Inspiron 1524 Function Keys

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I have an Inspiron 1525 and can find no explanation in the manual for what
the F1 and F3 keys do. It does describe the Media Keys and the Wireless key
(F2). F1 appears to just blank the screen very briefly and F3 appears to do

Would someone give me a clue about F1 and F2?

Thank you.

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