BUILT-IN MATHEMATICA SYMBOL

FrontEndDynamicExpression

FrontEndDynamicExpression
is a global front end option that specifies an expression to be dynamically updated whenever the front end is running.

Details Details

FrontEndDynamicExpression->Dynamic[expr] causes the expression to be tracked and updated in the usual way, except that expr is not displayed anywhere.
FrontEndDynamicExpression can be set using SetOptions[scope, FrontEndDynamicExpression->Dynamic[expr]], where scope can be $FrontEnd or $FrontEndSession.
FrontEndDynamicExpression can also be set using the Option Inspector (Format ► Option Inspector).

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