Final answer:
To open the force quit window on a Mac, press Command (⌘) + Option (⌥) + Escape (⎋). This allows you to close unresponsive applications.
Step-by-step explanation:
To open the force quit window on a Mac, you can use the keypress sequence Command (⌘) + Option (⌥) + Escape (⎋). This will bring up the Force Quit Applications window, where you can select the unresponsive application and click the 'Force Quit' button to close it. If the application is not responding, using the Force Quit option is a way to shut it down without having to restart your computer.