Users (category)
| auth_cookie_expiration | Allows you to change the lifetime of cookies used to authenticate users. |
| author_link | Allows you to change the URL of an author's archive page. |
| editable_roles | Allows you to change the list of site user roles requested by get_editable_roles(). |
| map_meta_cap | Allows changing the primitive capabilities required when checking a user's permissions. |
| post_types_to_delete_with_user | Allows you to change the list of post types to delete when a user is deleted. This applies only to posts created by the user. |
| the_author_posts_link | Allows you to change the HTML of the link to the author's post archive page. |
| user_contactmethods | Allows you to change a user's additional contact information. |
| user_has_cap | Allows you to remove or add capabilities for an individual user. |
| user_register | Fires immediately after a new user has been registered on the site and the user data has been added to the database. |
| wp_login | Fires after a user has successfully logged in. |
| wp_new_user_notification_email | Allows you to change the contents of the email sent to a new user upon registration. |