F17-F19 keys were introduced with the aluminium USB keyboard.
#APPLE COMPUTER KEYBOARD CHARGING PC#
Compared to their equivalents on the standard IBM PC keyboard layout the Command key and the Option key are located in reverse order. It functions as the Alt key in Unix and Windows environments. It serves the function of the solid-Apple key in Apple II applications. Like the Shift and Control keys, the Option key serves as a modifier for the Command key shortcuts, as well as being used to type many special characters.
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The key functions as a Meta key or Super key in Unix-like environments, and is equally equivalent to the Windows key in Windows environments, although in common applications it performs the same function as the Windows Control key.