M
mac*
Guest
when i am using some softewares, it needs me to press the F2, but when i press it, only the brightness of the screen would change, so how can i press the REAL F2?? 
technologist said:Pressing the fn key (ex. fn + F2) will make the top row of keys behave as F-keys.
If you use the F-key functions more often than the brightness, volume, etc., you can reverse this (fn+F2 for brightness) by checking the "Use F1-F12 keys for custom actions" box in the Keyboard pane in System Preferences.