network_admin_menu action-hook . WP 3.1.0

Fires before the administration menu loads in the Network Admin.

Usage

add_action( 'network_admin_menu', 'action_function_name_501' );
function action_function_name_501( $context ){
	// action...
}

$context(string)

Empty context.

Where the hook is called

do_action( 'network_admin_menu', '' );

Where the hook is used (in WP core)