>My understanding is that you cannot do this. At least with IIS 3.0 and earlier, using Web Connection you couldn't get the user name when using C/R. I'm not sure if this has changed in IIS 4.0 (or will change in NT 5). It might be unacceptable for some security reason I'm unaware of.

I was referring to ASP. Even with ASP, I can't even get the REMOTE_USER. So, to get that value, we need to force the user to login again on the Web. This is something I just can't understand.