This will display a list of your Mac’s four modifier keys, which by default are each set to their own function.
To remap your keyboard’s “modifier keys” - the name of keys that change the function of other keys or shortcuts, such as Command, Control, Option, and Caps Lock - in OS X, head to System Preferences > Keyboard and click the button labeled Modifier Keys in the bottom-right side of the window. Thankfully, users can solve this problem by optionally remapping the functions of their keyboard, effectively switching the Control and Command keys. This makes switching back and forth between using a Mac and PC a bit frustrating, as the user must adjust the position of their fingers after each switch to utilize all of the important keyboard shortcuts in Windows and OS X. Beyond this difference, Mac and PC keyboards also feature unique layouts, with the Alt/Option Key on a PC keyboard occupying the location of the Command Key on a Mac keyboard (immediately adjacent to the left and right of the Space Bar). On a PC/Windows keyboard, however, many of the same keyboard shortcuts utilize the Control Key (⌃) instead of the Command Key. The most important key on a Mac’s keyboard is arguably the Command Key (⌘), which is used in a tremendous number of important keyboard shortcuts, from Command-C to copy, to Command-P to print, to Command-Shift-3 to take a screenshot.
