'Tomcat - How to setup and use CATALINA_BASE folder?

I know CATALINA_BASE is pointing by default to the same folder as CATALINA_HOME, but how can I setup it so I can run multiple istances like it's mainly supposed to do?

Do I need to create a new unique folder with some specific files inside, or maybe i need to create one for each istance?

And what about assigning paths in the variable environment? Is it necessary or should I replace CATALINA_BASE variable somehow?

I'm working with Windows, but Unix indications would be appreciated anyway.



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