Is there anything unique about the architecture of onenote desktop that makes it so that it’s able to sync across multiple instances without being signed in to cloud?

How is onenote desktop able to sync across multiple instances without being signed in to cloud?? Apparently there are tons of people that are so ignorant that onenote does that, and they can't even imagine the idea that it's possible in other desktop apps

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This is what was needed/asked, and still is needed. Need mutiple apps that does this:

1. Desktop app where you can list todos
2. When you have an instance of this opened, and you open another instance on a different virtual desktop, it opens on that other virtual desktop
3. When you open a new instance, it opens to where you left off / are at
4. Loads fast
5. No web apps for this

Have tried a bunch of stuff, they don't do this

SAAS/Cloud is eating the world. Even tho SAAS/Cloud has won, and desktop development is extremely lacking, do you know of any helpful, and does the needs?

Please reply with something helpful. Thanks!