$loginsession = new Zend_Session_Namespace('valid_login');
$loginsession->login_username = $this->_getParam('username'); 

 To assign Value in Session

$sess = new Zend_Session_Namespace(’MyNamespace’);
$sess->username = ‘you_name’;

To Retrieve value of Session

$session = new Zend_Session_Namespace(’MyNamespace’);
$userName = $session->username;

To check validity of Session

If (Zend_Session::sessionExist()) {

    // do something.

}

To completely logout you will need to do the following

Zend_Session::destroy(true);                    
                

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