Description:
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I have a new session_id (and a new session file in the temp directory) on every page when call session_start() at the top of page.
The server is an apache 2.0.53 with php 5.0.3 on windows 2000 sp4.
php.ini is modify only in the section of Error handling and logging for debug use.

Reproduce code:
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//page 1 
<?php 
session_start();
$_SESSION['test']='123';
header("location:page2.php");
?>

//page 2
<?php
session_start();
echo $_SESSION['test'];
?>