Thanks Ray. They seem to be the same.
Howver in this codeblock
$ConditionalQuery->saveInSession("FrithsCart_OrderID");
$ConditionalGoTo = "";
if (function_exists("rel2abs")) $ConditionalGoTo = $ConditionalGoTo?rel2abs($ConditionalGoTo,dirname(__FILE__)):"";
$ConditionalQuery->redirect($ConditionalGoTo);
if (isset($_SESSION[$ConditionalQuery->SaveAs])) $ConditionalQuery->addFilter("OrderID", "=", "d",
Should
addFilter("OrderID",
be
addFilter("FrithsCart_OrderID",
?