F1 is the help key
F3 when you have internet explorer up, brings up the search side bar
F4 when you have net explorer up brings up the addrees drop down box.
Erm, mine goes all the way up to F15. Also, does it just depend on what application program is open? (For instance, I'm pretty sure those keys do different things in Word, etc.)
None of them are useful when I have IE on though anyway... my keyboard has hotkeys (keys at the top that are assigned to all of the functions... back, foreward, refresh, search, favorites, etc.)