shutdown from lock screen
is there a way to shutdown my Mac without logging in, when the computer screen is locked? when would I need this? when I'm in a hurry to shut the computer down - lightning; my wife or kids are logged in and I don't want to have to log in with my userid (wait for that to happen) then do a shutdown (again why? lightning, or just want to turn the Mac off)..
in windows (sorry for the bad word), when the screen is locked, I can shutdown or reboot the system whenever. I know I could ssh into the system to do this, but then I need another computer.
thanks