OK... I am a designer of a monthly magazine.
1. I want to create one pdf that can be commented on and approved by each editor.
2. I want them to be able to see everyone's notes as it gets approved by each of the editors.
3. I want them to be able to check out the file so that no one else can edit while it is checked out.
4. I would like to be able to do it online, without having to download the pdf to their personal computer so that it lives online.