1. A method for playing prompts during execution of a call flow of a network application, comprising the steps of: storing a plurality of subsets of prompt definitions associated with a particular language, each subset containing prompt definitions for prompts to be played during the call low, one of said subsets being designated as a base subset; designating, at a point in the call flow, one of said subsets of prompt definitions, other than the base subset, as an alternate subset; and thereafter, in response to a request to play a particular prompt, first searching the alternate subset to determine whether it contains a prompt definition for the requested prompt, and if so, playing the prompt according to the prompt definition in the alternate subset, but if the alternate subset does not contain a prompt definition for the requested prompt, then searching the base subset for a prompt definition for the requested prompt and playing the prompt according to the prompt definition in the base subset.