Imperian has hundreds of help files to help you learn more about the game and how to play.
7.7 Keys
A key is what is used to open locks on doors, chests, or other lockable things. Keys may be able to open several locks. If you have a key and it has your mark on it, you will be able to take it to a locksmith and ask them to copy it for you.
Usage:
COPY KEY <key#> <person the key is for>
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