We provide two separate sharing options that are very different in terms of power and scope.
The less powerful option is adjunct access. This lets one member of our service share SSH and SFTP access to a site with another member. This is a good option if you just have someone helping you develop the content of one site.
The more powerful option is account sharing. This lets a member share full access to an entire account and all of its contents with another member. This option is suitable for companies and organizations that can't have just one person who has the ability to manage content, or for shared responsibility, for example where one person is primarily paying the bills and someone else is primarily managing the services.