On the MacBooks I've seen, Page Up/Down is usually Fn+Up Arrow/Fn+Down Arrow. I don't know if this is implemented in software or hardware, though, so if you're

On the MacBooks I've seen, Page Up/Down is usually Fn+Up Arrow/Fn+Down Arrow. I don't know if this is implemented in software or hardware, though, so if you're running *nix, you might be out of luck.