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A guide to man-machine interface USER-FRIENDLY C:\ DUR Command not found. Try retyping USER-HELPFUL C:\ DUR I don't understand DUR. Do you mean DIR ? USER-UNFRIENDLY C:\ DUR C:\ DUR C:\ DUR C:\ DUR USER-HOSTILE C:\ DUR Ha! A mistake! I'm sure you meant to say FORMAT, so that's what I'll do...