Three web sites in one box on one IP.

Hello SuSE folkz, It's may be a stupid question but I couldn't find a decent answer on it. Assume that you have registered three domains: xyz1.com xyz2.com and xyz3.com with different IP's They all pointed to your ISP your_isp.com You have just ONE static IP from your ISP. ISP runs DNS with NAT, so all your three registered domains are pointing to your box. Now the question: Is it possible to create three virtual independent domains/websites on you box using just one IP provided by your ISP? Thank you very mush in advance for any information. Alex P.S. Our IS guys couldn't answer this question :)