8. A data processing system for enabling a visually impaired user to distinctly visualize individual displayed objects within multiple classes of objects displayed within a graphical user interface environment, said data processing system having a display pointing device associated with a moveable cursor element, a user input device, and an audio output device, said data processing system comprising: means for associating an audio signal having at least two audible characteristics with each object within a class of objects displayed within said graphical user interface environment, wherein a first of said at least two audible characteristics is common among all objects within a class of objects and unique among all of said multiple classes of objects within said graphical user interface environment, and a second of said at least two audible characteristics is unique among all objects within a class of objects; and means for generating a composite audible signal which includes elements of each audio signal associated with each of said objects displayed within said graphical user interface environment, wherein a user may determine how many classes of objects are displayed, and how many objects are displayed within each of said multiple classes of objects within said graphical user interface environment.
11. A data processing system according to claim 8 wherein said first of said at least two audible characteristics comprises a tone, and said second of said at least two audible characteristics comprises a periodicity.