Add hidden input to magento cart form and show it into admin/order

I need to开发者_StackOverflow中文版 add a hidden input to my cart form and show it ( if order is ok ) into order page in admin area, is it possible?

I try to follow this http://inchoo.net/ecommerce/magento/extending-order-object-and-hooking-on-event-in-magento/

but in 1.4.2 not work.. can someone help to to translate for 1.4.2?

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You can use the checkout success page to retrieve the last order ID and add a comment onto it.