1. Type Option-Command-Esc (this is the same method you mentioned about but with keyboard shortcut)
2. Option-RightClick application icon in Dock and choose "Force Quit"
3. Launch Terminal and:

• type killall -9 application-name

or

• type ps ax; you will get a long process list in the form:

[...]

6656 ?? S 0:22.89 /Applications/TextEdit.app/Contents/MacOS/TextEdit -psn_0_1155354

[...]

On process list find an application you want to kill. And type:

kill -9 PID

Where PID is the number on the left. E.g. to kill above TextEdit process you would type:

kill -9 6656

Be careful, because there is no additional warning message - be sure you are killing the right application.

1. Type Option-Command-Esc (this is the same method you mentioned about but with keyboard shortcut)
2. Option-Right Click application icon in Dock and choose "Force Quit"
3. Launch Terminal and:

• type killall -9 application-name (e.g. killall -9 TextEdit)

or

• type ps axc; you will get a long process list in the form:

[...]

6656 ?? S 0:22.89 TextEdit

[...]

In process list find an application you want to kill. And type:

kill -9 PID

Where PID (process ID) is the number on the left. E.g. to kill above TextEdit process you would type:

kill -9 6656

Remember that you are dealing with processes and every application can run one or more process, so sometimes more than one process should be killed to completely remove running application from the system.

Also be careful, because there is no additional warning message - be sure you are killing the right application.