Exactly what do the various Fn keys do?

I've recently bought a reconditioned Dell Latitude laptop, but it didn't come with any manuals. I just want to know EXACTLY what the F keys DO! e.g. what do I use F1, or F7 etc. FOR? Every so often I start to type something, and realize that somehow I must have hit some key that changes the characters I want to something else. Driving me crazy! Any help will be most gratefully received.
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More about exactly keys
  1. Depends on the model, but I'd start by looking here http://search.dell.com/results.aspx?c=us&l=en&s=gen&cat=sup&rpp=12&p=1&subcat=ddc&rf=all&nk=t&sort=K&ira=False&~srd=False&ipsys=False&advsrch=False&~ck=anav
  2. You can also try Googling for the user manual of your specific laptop.
  3. applications can assign different functions for the . .function keys 1-12.

    almost always F1 is HELP!
    F3 is search. . . keep forgetting F12 . . .
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