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The answer in both cases is quite probably the biggest and meanest 5250 program.

Why not consider replacing it with something better?

If this is true, then the next question should be: "Why are we spending all this time and effort trying to reuse it, instead of just starting to replace it with something better?"

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However, if the commercial reality is that for various marketing, business and political reasons it will need to be replaced sooner rather than later, you should seriously consider doing it now, instead of spending an unreasonable amount of time trying to reuse it and allowing it to become the complete center of attention to the detriment of all the other 5250 programs that also need to be modernized.