Deerpark,
My neighbor was told by his company's IT department , only 3 personnel, which he says do not have a lot of experience, that he could only access their site through a VPN and his wife could not be browsing the internet on her computer. I beleive as long as he does not enable file and printer sharing and continues to use a residential gateway and each of the computers has its own firewall setup that they should not have a problem comprimising the company site. I do not however have any formal training but only what I have picked up in setting up several of my own personal internet connections. Both your answer and the answer from another board appear to confirm what I beleive is possible. Hope this clears what I was trying to say in the last post.