SNOB - A SNOMED Browser
FAQ
What is the difference between notes and comment?
Notes are stored in a local database on your machine. Since all notes can be accessed at once, you can use them as bookmarks or favorites. Or you can link them to concepts you would like to present during a presentation.
Comments are remarks you want to send to some authority and on which you expect a reaction. By design, a comment is something other people can (or at least are supposed to) read.
Of course, you may also want to share your notes with other people, but these will almost always be people you know. You might even want to (and can) send a note as a comment.