Jane experienced her first locked up Mac application. The mail program was "continously beachballing" as they say. She asked what the equivalent of
<Ctrl><Alt><Delete> was and I didn’t know. Now I do:
If you have an unresponsive application (e.g., continuous beachballing), you can kill it with the combination of Command-Option-Escape. That will bring up a list of running programs from which you will be able to select the offending applications and force-quit it. You can also kill an application from the Dock, by clicking, holding down the mouse key, and selecting Force Quit. On rare occasions, neither of those methods will work, but you can still kill it by opening up Terminal (located in /Applications/Utilities), running top to find its process ID, and then typing kill -9 .