Three-variants: Press and hold, press-twice, or dedicated secondary lock keys. Cover labeling of the modifier key and the individual keys: show the correct mode for virtual keypads, never caps labels when in lower-case, put the shifted label above it and gray if needed, as on a hardware keypad, etc. Make sure to keep consistent: avoid having one lock key and the rest use press-twice, but if you do then make sure there's a reason like access to the fn number pad is needed sometimes; never switch modes between virtual and hardware keyboards, or when you switch between keypad and keyboard, etc.

ABOVE IS WRONG!

Make sure to mention finger-as-stylus inputs. Just emerging, but technically possible to do much the same with letter and handwriting recognition.

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Value in standing, moving, difficult environments, or for populations (or cultures) with little or no experience with keyboard entry, or no standard keyboard for the data type...

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