Is it alright to surf ptc sites from different computers???

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I know it is not allowed to register more than 1 account on a PTC site and to have a number of accounts registered from one IP. I always register on new PTC sites from my home computer, but I usually surf the sites on other computers at work. So far it has never caused any of my accounts being deleted, but I was wondering if it is fine or not. Has anyone had problems because of this?