exec is not such a good choice as it does not return. Click the first button, and that's all she wrote mate.
Best answer probably is to simply open another top level Tk window to display the text for the additional file.
I'm a newbie at Tk so I can't provide good code to do that, but it's likely to be fairly easy. Maybe I'll try after I've done the shopping :)
In reply to Re^3: how to open a separate notepad
by GrandFather
in thread how to open a separate notepad
by arunmep
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