Storing URL parameters in session variables

A typical example of storing URL parameters in session variables is a product catalog that uses hard-coded URL parameters created using a hypertext link to send product information back to the server to be stored in a session variable. When a user clicks the "Add to shopping cart" link, the product ID is stored in a session variable while the user continues to shop. When the user proceeds to the check-out page, the product ID stored in the session variable is retrieved.