Application/Document Control Close
The application or document control Close closes the active application window or document window.
To close the window:
-
Click the
(document) or 
(application)
button in the upper right corner of the title bar -
Click the application/document control button in the left side of the title bar
and select Close -
Press ALT+SPACEBAR+C (application) / ALT+HYPHEN+C (document)
-
Press ALT+F4 (application) / CTRL+F4 (document)