in_admin_header action-hook . WP 3.0.0

Fires at the beginning of the content section in an admin page.

Usage

add_action( 'in_admin_header', 'action_function_name_2227' );
function action_function_name_2227(){
	// action...
}

Where the hook is called

do_action( 'in_admin_header' );

Where in WP core the hook is used WordPress

add_action( 'in_admin_header', 'wp_admin_bar_render', 0 );