Abstract: A data processing system providing user interaction in multiple natural languages, including a processor for executing application programs and a memory for storing message files corresponding to the application program in at least one natural language and a link table for storing links between the application program and corresponding message files, wherein a link for an application program stores a natural language and a pointer to its message file, wherein the operating system for the processor establishes links when a message file is loaded into memory. The data processing system nests language information for nested application programs. A fall-back mechanism is used to provide a default language when a language desired by a user is not available or when nested languages are not available.