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Unlike a normal key like a letter or a number, modifier keys modify the function of another key. The regular function of the 7 key, for example, is to input the number 7, but if you hold down the Shift and 7 keys simultaneously, the ampersand (&) sign is produced.
Alt-F4 is another keyboard shortcut. This one instantly closes down the window you're currently using. Whether you're in an Internet browser or browsing through pictures on your computer, this combination will instantly close the one you're focused on.
Some of the effects of a modifier key can be seen on the keyboard as keys that have two actions, like the 7 key. Keys like this have two functions where the topmost action is activated with the Shift key.