What is the difference?

1.What is the difference between 1.register in the form that first came up when you use a new mac for the first time and 2.register online via apple web site with apple id involve?
because when you first use a new mac there are the info that you have to fill in to create an account

2.If i fill the info for the first time i open my new mac does it count to be "register the machine"? or not or it register in a part of Leopard but not the Mac Serial from hardware?????
Thank you in advance

Why?

ZiggyPastorius said:

I don't believe there's any difference. I registered when I first got my computer, and haven't done anything else. I believe the one on the Apple website is for people who don't (can you not? I don't remember) register at the very beginning.

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but why in the web site it require Apple ID to be "Register My Product" and there's non in the first-time-use mac fill-info and all my e-mail aren't Apple ID so that mean i didn't register or not?