Окно щелкнуло - что происходит потом?

Я использую это для загрузки файла

function cURLcheckBasicFunctions()
{
  if( !function_exists("curl_init") &&
      !function_exists("curl_setopt") &&
      !function_exists("curl_exec") &&
      !function_exists("curl_close") ) return false;
  else return true;
}

/*
 * Returns string status information.
 * Can be changed to int or bool return types.
 */
function cURLdownload($url, $file)
{
  if( !cURLcheckBasicFunctions() ) return "UNAVAILABLE: cURL Basic Functions";
  $ch = curl_init();
  if($ch)
  {

    $fp = fopen($file, "w");
    if($fp)
    {
      if( !curl_setopt($ch, CURLOPT_URL, $url) )
      {
        fclose($fp); // to match fopen()
        curl_close($ch); // to match curl_init()
        return "FAIL: curl_setopt(CURLOPT_URL)";
      }
      if ((!ini_get('open_basedir') && !ini_get('safe_mode')) || $redirects < 1) {
        curl_setopt($ch, CURLOPT_USERAGENT, '"Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.11) Gecko/20071204 Ubuntu/7.10 (gutsy) Firefox/2.0.0.11');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        //curl_setopt($ch, CURLOPT_REFERER, 'http://domain.com/');
        if( !curl_setopt($ch, CURLOPT_HEADER, $curlopt_header)) return "FAIL: curl_setopt(CURLOPT_HEADER)";
        if( !curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $redirects > 0)) return "FAIL: curl_setopt(CURLOPT_FOLLOWLOCATION)";
        if( !curl_setopt($ch, CURLOPT_FILE, $fp) ) return "FAIL: curl_setopt(CURLOPT_FILE)";
        if( !curl_setopt($ch, CURLOPT_MAXREDIRS, $redirects) ) return "FAIL: curl_setopt(CURLOPT_MAXREDIRS)";

        return curl_exec($ch);
    } else {
        curl_setopt($ch, CURLOPT_USERAGENT, '"Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.11) Gecko/20071204 Ubuntu/7.10 (gutsy) Firefox/2.0.0.11');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        //curl_setopt($ch, CURLOPT_REFERER, 'http://domain.com/');
        if( !curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false)) return "FAIL: curl_setopt(CURLOPT_FOLLOWLOCATION)";
        if( !curl_setopt($ch, CURLOPT_FILE, $fp) ) return "FAIL: curl_setopt(CURLOPT_FILE)";
        if( !curl_setopt($ch, CURLOPT_HEADER, true)) return "FAIL: curl_setopt(CURLOPT_HEADER)";
        if( !curl_setopt($ch, CURLOPT_RETURNTRANSFER, true)) return "FAIL: curl_setopt(CURLOPT_RETURNTRANSFER)";
        if( !curl_setopt($ch, CURLOPT_FORBID_REUSE, false)) return "FAIL: curl_setopt(CURLOPT_FORBID_REUSE)";
        curl_setopt($ch, CURLOPT_USERAGENT, '"Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.11) Gecko/20071204 Ubuntu/7.10 (gutsy) Firefox/2.0.0.11');
    }
      // if( !curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true) ) return "FAIL: curl_setopt(CURLOPT_FOLLOWLOCATION)";
      // if( !curl_setopt($ch, CURLOPT_FILE, $fp) ) return "FAIL: curl_setopt(CURLOPT_FILE)";
      // if( !curl_setopt($ch, CURLOPT_HEADER, 0) ) return "FAIL: curl_setopt(CURLOPT_HEADER)";
      if( !curl_exec($ch) ) return "FAIL: curl_exec()";
      curl_close($ch);
      fclose($fp);
      return "SUCCESS: $file [$url]";
    }
    else return "FAIL: fopen()";
  }
  else return "FAIL: curl_init()";
}