User detection

I have a question regarding user detection.

Previously I had the cookies deleted from the IE menu (Delete Cookies & Delete Files), but there was one website I visited still recognized me.

Does anyone know does the website detect me?

I have dynamic IP.

Is the website able to detect up to the network card phycical address level which cannot be changed?

Any idea on this issue will be appreciated. Thanks.

 

 

 

 

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