[Dismounted]

Here's how to log users in.

PHP Code:

setcookie(COOKIE_PREFIX . 'password', $password, time() + 14400);
setcookie(COOKIE_PREFIX . 'userid', $userid, time() + 14400);

$password = md5(md5(md5($password) . $salt) . $license); 


That's all there needs to be, other cookies will be automatically created by vBulletin.