public function DeleteUser($uid)
 {
     // Needed for logging
     $username = self::Username($uid);
     if ($username === false) {
         return false;
     }
     // Delete user and logout
     $ret = $this->Backend->DeleteLogin($uid);
     if ($ret === true) {
         ulLog::Log('delete login', $username, ulUtils::GetRemoteIP(false));
     }
     return $ret === true;
 }