/**
  *  Check whether a user is host in this virtual classroom.
  * @param String $login
  * @return boolean
  */
 public function isParticipant($login)
 {
     $session = $this->xmlApi->getBreezeSession();
     if ($session != NULL && $this->xmlApi->login($this->adminLogin, $this->adminPass, $session)) {
         return $this->xmlApi->isParticipant($login, $this->sco_id, $session);
     }
 }