hmm, I can't find the keycode for that button..
but I've made a small program which tells you the keycode for that button..
If you just execute it, press the F-lock button and send me the keycode, then I can try to make it flash..
cause I don't have a keyboard with that button..
and if somebody could do the same for the FN button on logitech keyboards, then I can fix that too
download keycode program here (.NET Framework 2.0 required..
download here)