Ever noticed the Fn key on your Mac or Windows computer? It serves several purposes, but you'll need to learn how to use it.

The function key combination varies depending on the manufacturer and model of your computer, but typically includes the "Fn" key and the key with a small monitor logo. For example, many HP ...

MacBook Pro Concept Images Highlight New Keyboard With Physical Function Keys. ByEwan Spence, Senior Contributor. Forbes contributors publish independent expert analyses and insights.