Bookshelf Features: What is a "personal ebrary account" and a "Bookshelf"?

To use certain ebrary features, you need to first sign in to your personal ebrary account.  These features include:Once you have a personal ebrary account, you will have your own personal ebrary Bookshelf as well.Note, preferences info (e.g., citation choice and language preference) are stored as "cookies" on the computer itself - so they follow the computer, not your personal ebrary account.  But your Bookshelf and things specific to your username (e.g., password, name, and email address) follow your personal ebrary account login.