NotebookDynamicExpression

is an option for notebooks that specifies an expression to be dynamically updated whenever that notebook is visible.

Details

NotebookDynamicExpression->Dynamic[expr] causes the expression to be tracked and updated in the usual way, except that expr is not displayed anywhere.

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Make a notebook that prints a message when it is selected:

Dynamic can be omitted from the right-hand side if :> is used:

Similarly, Dynamic can be omitted from the right-hand side if := is used in CurrentValue:

As with any other Dynamic expression, Refresh may be used to control reevaluation:

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