Inspiron 2200 Keyboard Function Keyes

I'm having trouble identifying the function of several keys on my INSPIRON 2200 laptop.Specifically the FN key & its relationship to the following keys:F2,F3,F8,F10,PgUp,PgDn,End,up arrow ,down arrow.I know I need to press the FN button & these keys @ the same time to make it work,but I don't know what they do.I know that for ex.if I press FN & Esc I will go in the stand-by mode.If I press FN & F1 I will go into the hiberation mode ,but my manual does not give any info on the rest.Can someone please help?
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