6. A data processing system as set forth in claim 5, wherein: said command to invoke another application program includes an intended interaction language; and said means for selecting the desired interaction language further selects from the intended interaction language.
6. A data processing system as set forth in claim 5, wherein: said command to invoke another application program includes an intended interaction language; and said means for selecting the desired interaction language further selects from the intended interaction language. 7. A data processing system as set forth in claim 6, further including: means responsive to a termination of the invoked application program for setting the current interaction language to a previous interaction language from the means for storing nested language information; and means for removing the previous interaction language from the means for storing nested language information.