An audible indicator such as an audio tone is associated with the importance of data elements displayed on a visual display screen of data processing apparatus such as a personal computer or work station. At least one characteristic of the audible indicator, for example its pitch or frequence of a tone, is associated with the importance of the data elements. When a user selects a particular date element on the screen, for example using a computer mouse, the audible indicator conveys the importance of the selected data element to the user. This enables visually impaired users to readily locate important data elements on a display screen without reading the entire screen using a screen reader.