Local testing of service bindings

Log time user and listener, random poster. I have a question on testing workers locally with service bindings. This doc:
https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/#local-development
Shows how you can start a wrangler dev -c from multiple directories.
My Questions:
Does running this command actualy start the local dev process for each of those TOML's or do I need to start them separately (I use 'npm run dev') or will that launch all of them? Sorry it just not clear from the doc what happens.
Cloudflare Docs
Facilitate Worker-to-Worker communication.
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