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based on an earlier version of the Wolfram Language.
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DialogProlog

DialogProlog
is an option for Dialog that can give an expression to evaluate before the dialog starts.
  • You must use a delayed rule of the form DialogProlog:>expr to prevent expr from evaluating prematurely.
  • Expressions given by DialogProlog are evaluated after symbol values are localized and before any expression given as the argument of Dialog is evaluated.
Enter a dialog, first printing out the stack:
Return from the dialog:
Enter a dialog, first printing out the stack:
In[1]:=
Click for copyable input
Out[1]=
Return from the dialog:
In[2]:=
Click for copyable input
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