Regenerate unique_key?

I want to use an installation to a multiple websites and in the config.php file I see a parameter called ‘unique_key’. It must be unique per installation? if it’s true how i can regenerate it manually?


does anyone know what this setting does

I think it just needs to be a unique GUID, per installation. It’s used in many parts of the code.

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I have a extension for unique key generator like a global key .
Please check : -
Thank You