http://3dmapping.cloud/about-3dmc/about-bookmarks/

What are Bookmarks ?

A Bookmark is a snapshot of your current View.  It holds the Resources, your Views, your Screen setup, your Point of View etc. If you're a Named User, you can simply save a Bookmark by opening the Bookmark sidebar, and hit Create.  Just enter an Name and you're done. You can save as many Bookmarks as you like.

Private

Bookmarks are private to you.  It helps you to go back to a viewpoint or situation that you marked as being relevant for a certain purpose. Therefore, make sure you give them a good name. Once you got many, you can use the search function to retrieve the one you're looking for. A Bookmark can also be edited.  You can change the name of update the view ad hoc.  

Sharing Bookmarks

Though a Bookmark is private to you, you can also share it with anyone through Guest Users.  Sharing a Bookmark is an ad hoc and informal way of sharing data and views.  The Guest User will have less tools available than you have as Named User. A Bookmark can be opened using a URL that you can provide to a co-worker - you can even send an email directly. You can also embed a Bookmark in a website, using HTML iFrame code that is presented to you. Bookmarks cannot be managed or tweaked.  There are only 2 options to be set:  

Formal Sharing

As sharing of Bookmarks is very ad hoc and informal, you may have the need for a more formal way of sharing data, where you can control who has access, tweak the appearance and features.  That way of sharing is called Publications.