Description:
------------
In IE7 beta 2 (so presumably the final article too?) a page/script with a call to $_SESSION to add/update/set a value in the session is reloaded/re-run/duplicated after a delay of between 5 and 25 seconds somehow (depending on environment).

No idea if this is an IE, PHP or (me) issue, but got to start somewhere :) Its totally broken my ordering system app I've been developing.. back to drawing board!

Reproduce code:
---------------
page one (index.php):

<? session_start();
$_SESSION['debug']['testpage'][] = date("ymd\-H:i:s");
echo '<a href="checksession.php">check session</a>'; ?>

page two (checksession.php):

<? session_start();
echo '<pre>';
print_r($_SESSION['debug']);
echo '</pre>'; ?>

Expected result:
----------------
Page one should write a date/time stamp to the stored session array $_SESSION['debug']['testpage'], once only!

When 'check session' is clicked you expect to be shown:

Array
(
    [testpage] => Array
        (
            [0] => yymmdd-hh:mm:ss
        )

)

Actual result:
--------------
When you view checksession.php in any browser besides IE7b2 you DO see:

Array
(
    [testpage] => Array
        (
            [0] => yymmdd-hh:mm:ss
        )

)

BUT if you've waited more than about 10 seconds or so (or you've refreshed) you'll see:

Array
(
    [testpage] => Array
        (
            [0] => yymmdd-hh:mm:ss
            [1] => yymmdd-hh:mm:ss
        )

)

Therefore TWO writes to session when only one was requested.