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1. What I did:

---file1.php---
<?php
session_start();
session_register('stack');
$stack[]='word1';
header('Location: file2.php');
?>

---file2.php---
<?php
session_start();
$stack[]='word2';
print_r($stack);
?>

2. What I expected to have happen:
---output---
Array ( [0] => word1 [1] => word2 )

3. What actually have happened:
---output---
Array ( [0] => word2 )

RTFM:

http://www.php.net/manual/en/ref.session.php


"If register_globals is disabled, only members of the global 
associative array $_SESSION can be registered as session
variables. The restored session variables will only be 
available in the array $_SESSION. "

You are right. Thanks!

But, I still got no session functionality unless I pass the session id along GET or POST data to other pages. The cookies are been accepted, so I don't have a clue of why this is happenning. Any idea?

Best regards,

Josue