PHP Auth on IIS

hi, just got another thing that im confused with again (unusual). looking through the PHP manual there is php auth functions. how can i get this working on IIS 6?

PHP Code:

---

<?php
  if (!isset($_SERVER['PHP_AUTH_USER'])) {
    header('WWW-Authenticate: Basic realm="My Realm"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'Text to send if user hits Cancel button';
    exit;
  } else {
    echo "<p>Hello {$_SERVER['PHP_AUTH_USER']}.</p>";
    echo "<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>";
  }
?>

---

i know i can set the auth type in inetmgr but i would like to specify users and passwords through php :)
thanks, dandono

i found the awnser hidden in the manual here.
it works now