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Interrupt Evaluation...

▪ Interrupt Evaluation interrupts the current operation being performed by the kernel.
▪ This dialog box appears when you choose Interrupt Evaluation from the Kernel menu during an evaluation. You can use this dialog box to abort an evaluation, or to examine its progress. If you click Continue Evaluation, your evaluation completes normally.
▪ Keyboard shortcuts: , ] ; , ] ,
Continue Evaluation
Closes the dialog box and lets your calculation proceed normally.
Abort Command Being Evaluated
Aborts the calculation. (This button is equivalent to the Abort Evaluation command in the Kernel menu.) If you click Abort, your calculation is stopped. The result entered in the notebook is a symbol, $Aborted, representing an interrupted calculation.
Enter Subsession
Initiates a Mathematica dialog within the interrupted calculation. (This button is equivalent to the Enter Subsession command in the Evaluation submenu.)
See Reference Guide: Dialog.
See the Mathematica book: Section 2.13.2.
▪ Some calculations may not be immediately interruptible, in which case you do not get the dialog box until the calculation is able to stop. Sometimes when using a remote kernel you may not be able to interrupt short calculations at all, because they are finished before the interrupt request can be transmitted over the network.
▪ When you have more than one kernel running at the same time (e.g., a local kernel and a remote kernel), this command applies only to the "current" kernel. You can have several interrupt dialog boxes visible at the same time, each labeled with the name of the corresponding kernel.
▪ If Mathematica is communicating with another program via MathLink, the "MathLink Control" options allow you to interrupt, abort, or kill the linked program.
▪ If Abort does not work (i.e., if the calculation still keeps running for more than a few seconds), you can choose Quit Kernel from the Kernel menu. If you do this, you will have to restart a kernel before you can evaluate anything else.