p ` |  Handles sending a password retrieval email to a user.   
[ login_header() ](https://developer.wordpress.org/reference/functions/login_header/) ` wp-login.php ` |  Outputs the login page header.   
[ signup_another_blog() ](https://developer.wordpress.org/reference/functions/signup_another_blog/) ` wp-signup.php ` |  Shows a form for returning users to sign up for another site.   
[ validate_another_blog_signup() ](https://developer.wordpress.org/reference/functions/validate_another_blog_signup/) ` wp-signup.php ` |  Validates a new site sign-up for an existing user.   
[ signup_user() ](https://developer.wordpress.org/reference/functions/signup_user/) ` wp-signup.php ` |  Shows a form for a visitor to sign up for a new user account.   
[ validate_user_signup() ](https://developer.wordpress.org/reference/functions/validate_user_signup/) ` wp-signup.php ` |  Validates the new user sign-up.   
[ signup_blog() ](https://developer.wordpress.org/reference/functions/signup_blog/) ` wp-signup.php ` |  Shows a form for a user or visitor to sign up for a new site.   
[ validate_blog_signup() ](https://developer.wordpress.org/reference/functions/validate_blog_signup/) ` wp-signup.php ` |  Validates new site signup.   
[ allow_subdirectory_install() ](https://developer.wordpress.org/reference/functions/allow_subdirectory_install/) ` wp-admin/includes/network.php ` |  Allow subdirectory installation.   
[ WP_Automatic_Updater::run() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/run/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Kicks off the background update process, looping through all pending updates.   
[ WP_Automatic_Updater::send_email() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/send_email/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Sends an email upon the completion or failure of a background core update.   
[ WP_Automatic_Updater::send_debug_email() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/send_debug_email/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Prepares and sends an email of a full log of background update results, useful for debugging and geekery.   
[ WP_Automatic_Updater::is_disabled() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/is_disabled/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Determines whether the entire automatic updater is disabled.   
[ WP_Automatic_Updater::is_vcs_checkout() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/is_vcs_checkout/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Checks for version control checkouts.   
[ WP_Automatic_Updater::should_update() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/should_update/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Tests to see if we can and should update a specific item.   
[ WP_Automatic_Updater::send_core_update_notification_email() ](https://developer.wordpress.org/reference/classes/wp_automatic_updater/send_core_update_notification_email/) ` wp-admin/includes/class-wp-automatic-updater.php ` |  Notifies an administrator of a core update.   
[ Core_Upgrader::upgrade() ](https://developer.wordpress.org/reference/classes/core_upgrader/upgrade/) ` wp-admin/includes/class-core-upgrader.php ` |  Upgrades WordPress core.   
[ Core_Upgrader::should_update_to_version() ](https://developer.wordpress.org/reference/classes/core_upgrader/should_update_to_version/) ` wp-admin/includes/class-core-upgrader.php ` |  Determines if this WordPress Core version should update to an offered version or not.   
[ Language_Pack_Upgrader::async_upgrade() ](https://developer.wordpress.org/reference/classes/language_pack_upgrader/async_upgrade/) ` wp-admin/includes/class-language-pack-upgrader.php ` |  Asynchronously upgrades language packs after other upgrades have been made.   
[ WP_Upgrader::download_package() ](https://developer.