I'm trying to install Windows XP Pro through QemuX and when it gets to the EULA agreements it asks me to press 'F8' to agree, but whenever I press F8 on my PowerBook it just tries to get rid of the keyboard lighting.
Use fn+F8. The default settings are to have the function buttons do stuff like volume, screen brightness, etc. and to use fn+F1/F2,etc. to actually send the F1/F2,etc. commands.