But the note you can attach to a zap, that also appears in Nostr clients. Is that a 'note' in the same way a post on nostr is a note? Or is that another note that just somehow appears here?
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Here is some reading on it:
Yes they are kind of nostr note.
GitHub
nips/57.md at master · nostr-protocol/nips
Nostr Implementation Possibilities. Contribute to nostr-protocol/nips development by creating an account on GitHub.

What are Zaps?
Learn about what Zaps are, how they work, and what you need to use them on your Nostr client.
I'm pretty sure you can add a message to any lightning network transaction because my wallet of Satoshi would show me what was written in zaps when I was using that to receive zaps