On my external mechanical keyboard the Super/Windows/CMD key is between Ctrl and Alt, but on the Mac keyboard it's between Alt and Space.
Can I swap CMD and Alt only on the external keyboard?
MacOS – Swap CMD and Alt only on external keyboard
keyboardmacbook promacos
Related Solutions
It seems to work at least on my Apple Wireless Keyboard. KeyRemap4MacBook should work with most external keyboards that don't have their own drivers.
You can use Control + Shift + Eject to put your display to sleep but also to lock your screen. If you don't have an Eject key, you need to use an Automator based workaround to assign your own shortcut. Alternatively, you can set a Hot Corner for the screensaver to start in System Preferences.
For the locking to work, you have to tell OS X to require a password immediately after sleep in System Preferences > Security & Privacy:
When this is set, the above key combo will lock your screen and a password is required to unlock it.
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Best Answer
There is a section dedicated to this under → System Preferences → Keyboard:
Open Modifier Keys… and reassign them from here:
These settings are specific to each external keyboard you have connected. They will “stick” between reboots, as well as whenever you unplug an external keyboard and plug back it in.