on some macOS versions, it's said that function keys F14 and F15 are mapped by default to decrease/increase contrast (although nothing is labelled on these keys on Macintosh keyboards).
Go to System Preferences > Keyboard > Shortcuts > Display and uncheck F14 and F15. THat's what I was previously reading; there's a control for these keys at System Preferences > Keyboard > Shortcuts > Display, but you can only access it if you have a non apple keyboard.
The F5 key is a function key found at the top of almost all computer keyboards. The key is most often used to refresh a web page in an Internet browser. F5 also has other uses depending on the computer and program, as mentioned below.
The F1 through F12 FUNCTION keys have special alternate commands. These keys are called enhanced function keys. Enhanced function keys provide quick access to frequently used commands that can increase your productivity. These commands are typically printed above or on the keys.
In most Microsoft Windows programs, the default function of F10 activates the menu bar or Ribbon of an open application. Pressing Shift + F10 is the same as right-clicking a highlighted icon, file, or Internet link.
To use the standard function keys, hold the Function (Fn)/Globe key when pressing a function key. For example, pressing both Fn and F12 (speaker icon) performs the action assigned to the F12 key instead of raising the volume of your speakers.
Macs do not have a F14 key. You can make your F key shortcuts by going to System Preferences/Keyboard/Keyboard Shortcuts.
The function keys or F keys are lined across the top of the keyboard and labeled F1 through F12. These keys act as shortcuts, performing certain functions, like saving files, printing data, or refreshing a page. For example, the F1 key is often used as the default help key in many programs.
Function Keys are keys on keyboard which cause operating system to command interpreter or an application to perform certain actions on the screen. There are 12 keys on the keyboard from F1 to F12. All keys are having different functions to perform.
F10. In Microsoft Windows, it activates the menu bar of an open application. Shift+F10 is the same as the right-clicking on the highlighted icon, Internet link or file.
SHIFT+F3=F15. SHIFT+F4=f16. SHIFT+F5=F17.
In general, they do nothing. Apple laptops don't have these keys, so there can't really be any major OS X functions mapped to them.
These are the primary defaults of what function keys do on an Apple keyboard when connected to a Mac: F1 – Decrease display brightness. F2 – Increase display brightness. F3 – Open Mission Control. F4 – Open Launchpad.
Press fn and the left shift key at the same time to enable fn (function) mode. When the fn key light is on, you must press the fn key and a function key to activate the default action.
The first way uses the fn key to display the function keys. In the Keyboard preferences, click the Keyboard tab and then choose Press Fn Key to Show F1, F2 etc. Keys. This adds the function keys to the touch bar when the Fn key on the keyboard is pressed.
Note. On most Mac keyboards, the Fn key is in the lower-left corner.
Apple has Mission Control for this: F3 will open Mission Control (which gives you an overview of all running applications, grouping windows from the same application, and your Spaces) You can open Mission Control preferences by pressing Option+F3 (Mission Control)
The function keys or F-keys on a computer keyboard, labeled F1 through F12, are keys that have a special function defined by the operating system, or by a currently running program. They may be combined with the Alt or Ctrl keys.
The F2 key is a function key found at the top of almost all computer keyboards. The key is most often used in Microsoft Windows to rename a highlighted file or icon.
The F7 key is commonly used to spell check and grammar check a document in Microsoft programs such as Microsoft Excel, Microsoft Word, Microsoft Outlook, and other Office products. Shift + F7 runs a Thesaurus check on the highlighted word.