Errors and Break Loops
You can abort a process (except a small number that cannot be interrupted) by pressing Command-period or by choosing Abort from the Lisp menu. You can suspend a process and enter a break loop to examine it by pressing Command-comma or by choosing Break from the Lisp menu.
There are often only two processes running: the main process, and a process which handles events. If there are only two processes running, then Command-period and Command-comma apply to the main process. To abort or break the event process, use Option-Command plus period or comma. If there are more than two processes running, a dialog appears allowing you to choose a process to abort.
Choose Continue or press Command-slash to resume the process that has been suspended. Continue is also available on the list generated by the Restarts command on the Lisp menu.
Certain MCL tasks (for example, garbage collection) cannot be interrupted. During these operations no other tasks can be performed and no other processes will be given time.
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