Git Notes Usage

I've been trying to write up the git-notes functionality a bit and I'm a tad confused about the remote workflow. To share them, is it only do-able by pushing via the full refspec (ie: 'git push origin refs/notes/*:refs/notes/*')? Likewise to fetch them from a server? Also, if two people write notes into the same namespace at the same time, how does one merge them? Is the only way to do so to actually checkout the notes branch into your working directory and merge the notes trees?

Thanks, Scott