A set of input keys on a personal computer or computer ... across the top of the keyboard (F1, F2, etc.). Function keys are often used with modifier keys to extend their capabilities.

In their original design ... can be modified by specific software settings. The F11 key on a computer keyboard is a function ...

Most laptops have at least one Control (CTRL) key, and standard PCs usually have two. These keys are used to optimize the other keys on your keyboard by giving them additional functions ...