Once upon a time, I had an application which would dim the screen of my Mac down to 0, and then exit. Somewhere along the way I seem to have lost the app and can no longer find it. Yes, I know I could ...

I used it on my PowerBook 170, and it was an epiphany. (That's when I first got hooked on being able to dim my screen using a hot corner.) It's from St. Clair Software, but, alas, it appears they ...