Wikipedia:Typewriter is the longest word that can be typed on only one row, which might be no coincidence as some believe that Christopher Sholes deliberately placed all its letters in the top row when designing the layout in order to ease demonstrations. Proprietory, protereotype and rupturewort are sometimes conjectured as the longest words but these are not available in most dictionaries. NB.The word QWERTY was the first message ever sent by e-mail.