A computer device, such as a mobile phone or PDA for example, is able to output a message based upon selection of a corresponding sequence of symbol. Such symbols can be polysemous in nature and thus be associated with a plurality of different meanings depending upon other symbols sequenced therewith. By utilizing polysemous symbols, a relatively large number of sequences can be developed and associated with stored messages in the computer device. To aid a user in accessing a desired sequence or to aid in training the learning of stored sequences, for example, a category relating to at least two symbol sequences is fed back to the user upon pre-selecting a symbol; a theme relating to at least two symbol sequences is fed back to the user upon selecting a symbol and pre-selecting a next symbol; and/or a message associated with a sequence is fed back to the user upon selecting and/or pre-selecting at least one symbol completing a symbol sequence.