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Magento external login will not create session cookie
//Get Magento session-object
Mage::getSingleton("core/session", array("name"=>"frontend"));
$session = Mage::getSingleton("customer/session", array("name"=>"frontend"));

//Check if logged in
if(!$session->isLoggedIn()){
    //Not logged in, therefor log in
    $mpassword = $this->getMagentoPassword();
    $musername = $this->getAddress();
    try
    {
        $session->login($musername, $mpassword);
    }catch(Exception $e){
        echo $e->getMessage();
    }
}