Mage_Connect_Packager::writeToRemoteConfig PHP Method

    public function writeToRemoteConfig($cache, $ftpObj)
    {
        $wd = $ftpObj->getcwd();
        $ftpObj->upload("connect.cfg", $cache->getFilename());
        @unlink($cache->getFilename());
        $ftpObj->chdir($wd);
    }