Handy Hint 54 - Where is Ctrl-Alt-Del on my Mac / Force Quitting mis-behaving apps

Those who have come to Mac from Windows find themselves looking for the equivalent of Control-Alt-Del on their Mac - so that they can view what programs/apps are running and, where necessary, force quit an app that is mis-behaving.

This hint shows a couple of ways to bring up a special window that allows you to choose what program/app to terminate.  

This Handy Hint has been moved - view it here: Where is Ctrl-Alt-Del on my Mac for Force Quitting mis-behaving apps