The System Information app gives you detailed information about your Mac hardware and software. Use Siri to do things like open files or apps, or find things on your Mac or on the internet. You can set options to, for example, change the size and location of the Dock, apply a light or dark appearance, use a different desktop picture, and more. See Customize your Mac with System Preferences. To customize your Mac, choose Apple menu > System Preferences. For example, pressing Command-S usually saves a document or file.
To perform actions or shortcuts, use the Command key with keyboard combinations. To close a window, click the red Close button in the top-left corner of the window. To show all the open windows in the current app, Control-click its icon in the Dock, then choose Show All Windows. Release the keys when the app you want is selected. To switch between open apps, press Command-Tab. Press Return to open the selected menu, then use the arrow and Return keys again to choose menu options. To use the keyboard to open menus in the menu bar at the top of the screen, press Control-F2, then use the arrow keys to select a menu. For example, to enter é, press Option-E, then press the E key again. To enter special characters, press and hold the Option key in combination with letter keys.
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