>There are some other options, like changing color or alternate fonts, but those are generally just more complicated. The all caps thing is a holdover from the

>There are some other options, like changing color or alternate fonts, but those are generally just more complicated. The all caps thing is a holdover from the era of typewriters. On most typewriters, switching to bold face required changing the daisywheel or type ball; alternate colours would be lost on xerox- or carbon-copied documents. All caps was the most convenient option. It's now a vestigial convention, like the floppy disk save icon.