Arasen 0 Newbie Poster

Hello Everybody!
Am new on this forum, I apologise if am not up to the expected requesting mode. Well, my problem is that my website is set on IIS v5.1 (am not very popular with Web Development; am developper in OOP) and I must get the IP of all the users of the website via environment variables. Can someone please help me with this? Is it possible to set/configure/use environment variables in IIS v5.1?
Thank you very much in advance.