evaluates expr, making use of a front end if necessary.
- UsingFrontEnd is primarily relevant for standalone kernels and other configurations where a front end cannot be assumed to be running.
- UsingFrontEnd[expr] enables notebook functions such as NotebookWrite during the evaluation of expr.
- UsingFrontEnd[expr] evaluates expr in the current Mathematica kernel, starting a front end if it is not already running.
- UsingFrontEnd temporarily sets $Notebooks and $FrontEnd.
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