backend - Magento, see if back-end user is online? -

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i have magento website. there admin user, thats me, , other user. how can see if other user logged in (back-end) ?

edit

thanks sandeep have this:

<?php        $session = mage::getsingleton('admin/session');     $userdetails = mage::getsingleton('admin/session');       // data session $userid =      $userdetails->getuser()->getuserid();       // user id $userid =      $userdetails->getuser()->getemail();      // use 'admin/session' object check loggedin status     if ( $session->isloggedin() ) {         echo "ingelogd";     } else {         echo "niet ingelogt";     } ?> 

$session = mage::getsingleton('admin/session');  // use 'admin/session' object check loggedin status if ( $session->isloggedin() ) {    echo "logged in"; } else {    echo "not logged in"; }

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