Other sources such as books and computer games are not included as canonical, but are covered by Memory Alpha in a way which sets it apart from other "Trek" resources: books, comics, and other products are included as articles about the products (i.e. from a "production point of view"), but "in-universe" information unique or new to them is covered on the product page. For example, in the "" line of books, a new host of characters is introduced to the Trek universe, and their vessel is known as the USS "Excalibur". The characters, ships and information from "New Frontier" books do not receive pages of their own, but they are covered on the pages about the books. In this way, Memory Alpha remains all-inclusive while attempting to distinguish the canon from apocryphal material.