As was already said, Command-W. This will always close the active window. What’s not as obvious is how to close this window without the mouse when you have swi

As was already said, Command-W. This will always close the active window. What’s not as obvious is how to close this window without the mouse when you have switched to some application and Force Quit is no longer the active window. Command-Tab won’t allow you to switch to the Force Quit window since it’s not treated as an app by OS X. However, you can switch to the window by simply using the command for Force Quit again, i.e. pressing Command-Option-Esc, then closing the now active force quit menu with Command-W.