It is possible. You can use the "File/Open" command to open a notebook from any folder.

And edit the "backup.folder" parameter in cintanotes.settings to change the location of the backup folder.

That's great! Please let me know if the text gets highlighted for no reason again.

Welcome ;)

If you don't use syncing, then CN's security should be ok for you. It uses AES-256 for encrypting whole notebook file.

I guess it shouldbe possible to look for a note with a given UID in the current notebook when the notebook with target ID is not available. But I need to check

Hi and thanks for posting the question!

The best way would be using SN sync of course, but you've ruled that out.

Maybe it will be easier for you to place the notebook file in a shared network folder and work with it together?

What color do you use as background window color in Windows? I suspect it's not white

Released in 3.5