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The extended keyboard allows for much more modifier keys to create ligatures, as can be seen in the table: The difference between the US and extended keyboard is more profound. The US keyboard only does this when the alt key is pressed. The difference is that the US International turns the tick (`) and single quote (') keys into modifier keys (for grave accent and acute accent). The US keyboard and US International keyboards are very similar. I'll list three examples here, the US, US International and ABC-Extended (previously: US Extended) keyboard. Mac OS X offers 139 software keyboard layouts. The keyboard layout software translates a key press to a character on screen. This preference is retained in the file /Library/Preferences/ after the keyboard is unplugged and plugged back in. Users may see a dialog choosing a layout of ASCI, ISO 9995, or Japanese. If a generic keyboard is plugged in to the Mac, the user is asked to press the keys next to the shift keys for detection of the type of keyboard. How to identify keyboard localizations (Apple Knowledge Base HT2841).Other countries have more profound differences. The only difference between the International English and Dutch keyboard is the Euro symbol as the second alternative to the "2" key: This key does not exist on the US keyboard. The key left of the "1" key on the International English is a Paragraph (§) / Plus-minus (±) key.

On the US keyboard, the tick/tilde key is located left of the "1" key, while on the International English keyboard, the tick/tilde key is located left of the "Z" key, by claiming part of the shift key to make room for this key. The only difference between the US and International English keyboard is the tick (`) / tilde (~) key and the paragraph (§) key. The International English and Dutch keyboards are based on the ISO 9995 standard: The US keyboard is based on the ANSI standard: In the Netherlands, Apple ships three similar keyboards: Apple Knowledge Base HT2841 lists 32 different keyboard layouts. This affects the configuration of the keys on your keyboard. When ordering Apple Macintosh hardware, you are given a choice of keyboard layout.