4. The method recited in claim 1 wherein the prompt definitions in the base subset and in each of the other subsets has an identification code (ID) associated therewith.
4. The method recited in claim 1 wherein the prompt definitions in the base subset and in each of the other subsets has an identification code (ID) associated therewith. 6. The method recited in claim 4 wherein said step of first searching the alternate subset to determine whether it contains a prompt definition for the requested prompt, comprises searching the alternate subset to determine whether it contains a prompt definition having the ID of the requested prompt.