To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.

The developpers know why. In a little window, you will obtain for each key down its character,its ASCII code, and the keyboard code in hexadecimal. Exists for Mac OS, Mac OS X and Windows 95. MacBook Pro - Late 2009 / 2.53GHz / 8 gig Ram / 250HDD, Mac OS X (10.6.3), Time Capsule 1TB / iphone 3GS Posted on May 31, 2010 9:32 PM Reply I have this question too ( 24 ) I have this question too Me too (24) Me too. Key Codes is a lightweight and very easy-to-use Mac OS X application specially made for developers that might need to view certain key codes. Codes for keyboard characters or key codes, are computer code values for common characters, such as the Unicode or HTML entity codes. Mac Product Key Finder is freeware program for recovering lost product keys (or making backup before it's too late) for software installed on your Mac. This small tool will scan your Mac for installed applications and show your product keys (serial numbers). In two words it is doing same job as KeyFinder for Windows, but in Mac OS. From a Mac OS X point of view, this is less than ideal; the Alt key (which appears on both sides) is the best candidate for use as the Command key. Obviously this configuration varies by laptop.

• Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
  
• Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
  
• Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
• Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
• D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
• N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
• Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
• T: Start up in target disk mode. Disabled when using a firmware password.
• Command-V: Start up in verbose mode. Disabled when using a firmware password.
• Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.

If a key combination doesn't work

If a key combination doesn't work at startup, one of these these solutions might help:

• Be sure to press and hold all keys in the combination together, not one at a time.
• Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
• Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
• If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
• If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.

Remember that some key combinations are disabled when your Mac is using a firmware password.

How To Update Mac Os X

Learn more

• Learn what to do if your Mac doesn't turn on.
• Learn about Mac keyboard shortcuts that you can use after your Mac has started up.

15 Startup Key Combinations For Mac – The Mac Observer

Key Codes is a unique utility application that helps in showing the modifier keys state, Unicode value and key code for the key combinations you tap on. The application is quite useful for the application developers and web designers.

Powered by Many tricks, Key Codes is one of its kind applications that enable the displaying of Unicode value, key code and modifier keys state for the key combinations users tap on. The utility application can run on platforms like Power PC dependent MAC OS (MAC OS X) and Intel.

The application comes for free and can be downloaded from the App store. The users can toggle the codes between the floating statuses of the windows from the windows menu. Added to that, the application also has an inbuilt apple news module to give updates for the buyers at the apple stores. A user friendly ambience and interesting interface is an added bonus for the users of this application.

Key Codes For Mac Os X 10.10

Features of Key codes

1. Easy to use interface- The application has an easy to use interface that helps the users to navigate through it (Key Codes) easily and the user friendliness makes it easy to operate.
2. Displays key combination details- The unique application displays the key combination details like the key code, Unicode, modifiers, keys and characters. The information is quite helpful in web development and programming.
3. Log key button- the log key option helps the user to define the modifier changes as well as the log key up events.
4. ideal for any device- The utility application is compatible for any device. It can be used in Mac OS, iPod touch, iPad and iPhone.
5. Toggle key codes- the users can easily toggle between the floating statuses of Windows from the windows menu.
6. Information, news and updates- Key Codes has an inbuilt news module that provides latest news, updates and information from the Apple store to help the buyers get the updates about the latest application and devices.
7. Lets the user ‘un-float’ the window- Key Codes enables the user to un-float the window using the windows menu.
8. Simplistic approach- The application has a very simple approach and gives the important information on keys.
9. Open source- The application is open source, and the Mac developers and other users can simply download it to use.
10. Access it without downloading- The application can be accessed and used without downloading. The users can simply visit the homepage of the application to use it.
11. Basic key code explorer application- Key Codes is a basic Key Code explorer application for the Mac OS X developers. Added to that, it is universal binary.

Macos - Where Can I Find A List Of Mac Virtual Key Codes ...

Key Codes is a very helpful utility tool for the developers working on MAC OS X platform. Moreover, the application is free to use which is an added benefit for the Mac users.

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