| register_new_user() | Handles registering a new user. |
| wp_create_user() | A simpler way of inserting a user into the database. |
| wp_delete_user() | Remove user and optionally reassign posts and links to another user. |
| wp_insert_user() | Insert a user into the database. Create/update a user. |
| wp_new_user_notification() | Email login credentials to a newly-registered user. |
| wp_update_user() | Update a user in the database. |