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Built-in Mathematica Symbol

DialogProlog

DialogProlog
is an option for Dialog which 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:

Out[1]=

Return from the dialog: