Description of Using the Request.ServerVariables Object :
You can learn in detail about Request.ServerVariables Object along with it's benefits from this tutorial. Here, the author describes how all environment variables can be obtained through ASP script. And the sample program lets you clearly understand the process of retrieving user name and IP address of a visitor. And from the given property list of Request.ServerVariables Object, you can learn which one of them can be used to collect needed information.