This is even visible in the OS-controller Window Menu - hit Alt+Spacebar in any window of any app, and you'll see the Window menu appear, which will include an option for Close (the current window), showing that the shortcut for it is Alt+F4. This is even true for modal dialogs (if they are real Windows modal dialogs).
This is even visible in the OS-controller Window Menu - hit Alt+Spacebar in any window of any app, and you'll see the Window menu appear, which will include an option for Close (the current window), showing that the shortcut for it is Alt+F4. This is even true for modal dialogs (if they are real Windows modal dialogs).