56. A method as set forth in claim 55, wherein: said command to invoke the second nested application program includes an intended interaction language; and said step of selecting the desired interaction language further includes selecting from the intended interaction language.
57. A method as set forth in claim 56, further including: selecting a natural language from the current interaction language and the default language responsive to a command by an application program to retrieve a message and for retrieving said message from the message file containing messages in the selected natural language.