Force customer login in magento

$customerId = (int) $this->getRequest()->getParam('id');

$customer = Mage::getModel('customer/customer')->load($customerId);

$userSession = Mage::getSingleton('customer/session');

$userSession->setCustomer($customer);

Mage::dispatchEvent('customer_login', array('customer'=>$customer));

$this->getResponse()->setRedirect(Mage::getUrl('customer/account'));

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July 25, 2013