"DebuggerToggleBreakpoint" is a front end token that converts all messages generated during the evaluation into breakpoints.

"DeleteGeneratedCells" is a front end token that deletes all cells in the notebook that have been produced as output by the kernel.

"DuplicatePreviousInput" is a front end token that duplicates the contents of the nearest input cell above.

"DuplicatePreviousOutput" is a front end token that duplicates the contents of the nearest output cell above.

"EvaluatorAbort" is a front end token that aborts the kernel operation in the specified kernel.

"EvaluatorHalt" is a front end token that interrupts the current evaluation and displays the evaluation stack.

"EvaluatorQuit" is a front end token that terminates the specified kernel.

"EvaluatorStart" is a front end token that starts the specified kernel.

"ExpandSelection" is a front end token that selects the next smallest subexpression containing a selection.

"ExplainBeepDialog" is a front end token that opens the Why the Beep? dialog with an explanation of why the front end produced a beep.