The ornamental design for a compositedesktop on a computer display screen, as shown and described.
The file of this patent contains at least one drawing executed in color.
Copies of this patent with color drawing(s) will be provided by the Patent
and Trademark Office upon request and payment of the necessary fee.
FIG. 1 is a front view of a composite desktop on a computer display screen;
FIG. 2 is a front view of a second embodiment thereof; and,
FIG. 3 is a front view of a third embodiment thereof.