Changes

For ''readonly'' logins it's fine for multiple users to share a single login, although it is best not to be using it concurrently. However, if the users are going to be making changes it's best if each user has their own login. First, you maintain a strict and unambiguous audit log of who made what changes and when. Secondly, when users change certain preference settings then that can create conflicts with other users using who are utilizing the same login credentials.