You can choose the first menu item in the Apple menu at the upper left corner to get the About This Mac box. Then click on More Info… to launch the System Profiler. But you can also hold the Option key and the first item in the Apple menu now a direct link to the System Profiler.
Related: Quickly Always Open With, Adjusting the Alert Volume From the Menu Bar, Quickly Look Up and Search In Safari, Change Menubar Icon Order, Launch Applications From the Spotlight Menu.
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