Macintosh Computers
On Apple Macintosh computers, the key is rebranded into a Help key. When pressed, the Help functionality of the application in use will be launched. However, when using command line applications, it retains its original functionality for compatibility reasons. On the latest keyboards from Apple it has been replaced by a Fn key. On such models, "Insert" is sometimes obtained by pressing the Fn key and the Enter key, or the Fn key and the numeric keypad 0 key. Other times, "Insert" is obtained by pressing the Fn key and the numeric keypad / key.
Read more about this topic: Insert Key