When you see a two-dimensional expression on the screen, you can edit it much as you would edit text. You can for example place your cursor somewhere and start typing. Or you ...

Abort Evaluation aborts the current evaluation.

Interrupt Evaluation interrupts the current operation being performed by the kernel.

"EvaluateCells" is a front end token that sends the selected cells to the kernel for evaluation.

"EvaluateInitialization" is a front end token that evaluates all the initialization cells in a notebook.

"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.

Principles of Evaluation Reducing Expressions to Their Standard Form Attributes

"EvaluatorInterrupt" is a front end token that interrupts the specified kernel and opens the Local Kernel Interrupt dialog.

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