When users save a project as a URL, multiple access points should be shareable. Some users might wish to share the full project, others might wish to draw attention to a particular page, while others might wish to share an experience thread. Here is a draft spec for distinguishing the various URL types for loading the project. Of course if a user is not logged in, they will not have the permissions to switch from the “present” mode to the “design” mode (and of course they will only have read only permissions).