WordPress at a glance
filter is not described

admin_title filter-hook . WP 3.1.0

Filters the title tag content for an admin page.

Usage

add_filter( 'admin_title', 'filter_function_name_3236', 10, 2 );
function filter_function_name_3236( $admin_title, $title ){
	// filter...

	return $admin_title;
}
$admin_title(string)
The page title, with extra context added.
$title(string)
The original page title.

Where the hook is called

In file: /wp-admin/admin-header.php
admin_title
wp-admin/admin-header.php 61
$admin_title = apply_filters( 'admin_title', $admin_title, $title );

Where the hook is used (in WP core)

Does not used.