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The FN key, which stands for Function, is used to switch from F1-F12 keys to the pictures that are showed on those keys. Holding the FN key and a F key will do what the picture on it says.

For instance, allow us to say the F5 key contains a picture of a computer and a projection screen being separated by the | symbol. Pressing the FN key with that key (F5, as described) will only act on what the picture says, in which for this example, pops up projection options. (For Windows 10: Computer only; Both; Extend; Second screen only)

Most keyboards contain an Esc (Escape) key. Under it would usually be a picture of a mousepad with an ‘X’ in it. Using Fn + Esc will disable the mouse. This means that the mouse will become unusable — clicking is disabled, moving it is disabled…basically disable the cursor.

The Ctrl key (Control) is similar; It acts as a “Shift” to enable the alternate key.