_user_admin_menu action-hook . WP 3.1.0

Fires before the administration menu loads in the User Admin.

The hook fires before menus and sub-menus are removed based on user privileges.

Usage

add_action( '_user_admin_menu', 'action_function_name_2864' );
function action_function_name_2864(){
	// action...
}

Where the hook is called

do_action( '_user_admin_menu' );

Where the hook is used (in WP core)