And how many people actually use function keys any
more in the age of the
GUI and mouse?
I use ALT-F4 in Windows to quit programs, CTRL-F4 to close windows,
CTRL-F6
to change to the next window, F7 to run spell check in M$-Word, and
Shift-F7 for thesaurus.
In Linux, ALT-Fn switches to virtual terminal n.