When you assign rights to the library's users, you can choose to allow them to make reservations and/or place orders with the library.
Reservations ("PermitReservation") allows users to make reservations for books and other materials not currently available (borrowed by other user).
Orders ("PermitItemOrder") allows users to order material regardless of whether they are avaliable at the library or not.
When the right "PermitItemOrder" is activated, a link "Order" is displayed on a record for the user to click.
The librarian can choose to receive a notification when new orders from users are posted.