Here's a list of the special key's on the FS series of laptops, along with a desription of what they do & what they look like..
Fn key= modifier (Fn written on key)
Fn+F2 key= Mute Speakers (picture of speaker with + inside it)
Fn+F3 key= Volume Down (increasing slope with – next to it)
Fn+F4 key= Volume Up (increasing slope with + next to it)
Fn+F5 key= Brightness Down (picture of sun with – next to it)
Fn+F6 key= Brightness Up (picture of sun with + next to it)
Fn+F7 key= Swap Between LCD & Externall Monitor (2 square's seperated by / with LCD wrote in the first one & an arrow facing out of the right side from the middle of the second box)
Fn+F10 key= Zoom (picture of magnifying glass with + inside it)
Fn+F12 key= Sleep (picture of a battery with an arrow going in it & 2 z's coming out like snore signs)
S1= Programable Key (S1 written on key)
S2= Programable Key (S2 written on key)
It's helpful to developers if you include this list with any bug reports that you submit about the special keys.