A computer system having a computer and a keyboard is provided. The keyboard includes a plurality of first letter keys and respective second letter keys. Each of the first and second letter keys is associated with a respective letter. The computer system is arranged: (i) upon activation of one of the first letter keys to register the selection of the corresponding letter; and (ii) upon activation of one of the second letter keys to present to a user a predefined list of one or more words. The words of each list are associated with the corresponding letter. The computer system is further arranged to register a selection by the user of one of the presented words.