Would you like to test or style your stores success.phtml without reordering all the time? It can be done using the following temporary change:
Open /app/code/core/Mage/Checkout/controllers/OnepageController.php and look for the successAction() function. Now remove the line $session->clear();.
Important: Please note that modifying Magento core files is considered very bad practice! If you have to modify core files, always override them in your local code pool!
Testing the success page (success.phtml) without reordering
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