For most folks, "lights out" formatting is a fully automated process
with no manual steps, completely controlled by the stylesheets,
transforms, etc.
In your case, Ed, it's when the creaky electrical system in your
building goes on the fritz again and you need to finish a formatting
job quick before your UPS gives out.
I'm sure Suzanne would like me to emphasize that FOSI is a good choice
for either scenario, but I'd also point out that APP is pretty handy
on both counts, as well. 🙂
-Brandon 🙂