Evergreen's circulation features are customizable, allowing libraries to give privileges based on the library, patron, item, and bibliographic information. Major notable circulation features include the ability to send patrons courtesy notices of due items; to access all relevant patron information in a single window; to define arbitrary fields when entering patron information; to create an unlimited number of notes about a patron; to replace patrons' cards without needing to re-register or clone them; to link patron accounts into family groups; to circulate non-cataloged and pre-cataloged materials; to customize template-based receipt printing; to continue circulation when Internet access is down; to give front-desk staff access to billing and financial information; to show patrons their accrued late fines in real time; and to allow patrons to pay their fines in whole or in part.