TraceDialog
 Usage
• TraceDialog[expr] initiates a dialog for every expression used in the evaluation of expr.
• TraceDialog[expr, form] initiates a dialog only for expressions which match form.
• TraceDialog[expr, s] initiates dialogs only for expressions whose evaluations use transformation rules associated with the symbol s.
Notes
• The expression to be evaluated when a dialog is called is given as Out[$Line] of the dialog, wrapped in HoldForm. The expression can be seen by asking for % when the dialog is first started. • Any value returned from the dialog is discarded. • TraceDialog[expr] returns the result of evaluating expr. • New in Version 2.
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