in reply to Re: The most useless key on my keyboard is:
in thread The most useless key on my keyboard is:

On the other hand, I have not used a program in the last 10 years that used F12 for anything. That key got my vote.
I use the F12 key whenever I leave my desk: it locks my screen:
$ grep F12 ~/.fvwm2rc Key F12 A N Exec xscreensaver-command -lock
Perl --((8:>*