Curl problem

[mpop]

I have a question. I got this code

curl_setopt($ch, CURLOPT_URL, "http://unsite/login.php");
curl_setopt($ch, CURLOPT_POSTFIELDS, "user=user&pass=pass");
$xxx = curl_exec($ch);
curl_setopt($ch, CURLOPT_URL, "http://unsite/email.php");
$xxx = curl_exec($ch);
curl_setopt($ch, CURLOPT_URL, "http://unsite/email.php");
$xxx = curl_exec($ch);
curl_setopt($ch, CURLOPT_URL, "http://unsite/email.php");
$xxx = curl_exec($ch);

Now, first time i use curl_exec($ch) it will try to log in the site, second time it will log in the site and the follow the link "hxxp://unsite/email.php", third time log in again and and go for two times on the link "hxxp://unsite/email.php"?

Or, first time it log in, second it follow the link, third follow the link again, ans so on?

I just want to know if every time i use curl_exec() function will it log in the site?