How can you identify which applications are installed on your Mac?

Three ways to forcibly quit an application from the graphical interface are from the Force Quit Application dialog accessed from the Apple menu; from the Dock application shortcut menu accessed by Control-clicking or right-clicking the application's icon; or from the /Applications/Utilities/ Activity Monitor application.

You can use the System Information application to easily scan all the appropriate application locations and return a list of installed applications.

The Activity Monitor application is used to monitor open processes and applications.

Disk Utility is the primary application for creating and managing disk images.