Dell Latitude E6400 function keys do?

Can anyone explain what each of the Function+F keys do on an E6400 laptop? 


For instance, Function+F1 seems to be a hibernate hotkey. the icons on F2-F12 do no make any sense to me. Pressing them seems to have no effect on the computer. 


Can anyone list the purpose of Function+F1 through Function+F12? 

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