wp_check_browser_version()
Function: Checks if the user needs a browser update.
Source: wp-admin/includes/dashboard.php:1584
_access_denied_splash()
Function: Displays an access denied message when a user tries to view a site’s dashboard they do not have access to.
Source: wp-admin/includes/ms.php:558
redirect_network_admin_request
Filter Hook: Filters whether to redirect the request to the Network Admin.
Source: wp-admin/network/admin.php:29