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[cd34]

that assumes that you have RegisterGlobals turned on -- which used to be the default for php, however, most hosting companies turn it off.

If you're going to use $affcode, do something like:

incoming link: http://domain.com/page.php?affcode=asdf

At the top of the page:
<?php $affcode=$_REQUEST['affcode'];?>

then, in each of your links

<a href="page2.php?<?php echo $affcode;?>">page 2</a>