REMOTE_USER Without 401 Authentication

Hello, I've got two servers, one is AD server on Windows Server 2008R2 and second is Windows Server 2008R2 IIS Web Server,

I want to have an authentication without 401. I want to get REMOTE_USER, LOGON_USER or AUTH_USER variable from AD users without 401 dialogue box, I know that it's possible, I've seen this type of applications.

Question is, which type of authentication should I use?

Windows, Anonymous or another one?

Is it possible to get this variables by PHP or should I use ASP.NET

Everything to be clear, my main goal is that AD users should authenticate on my intranet application without 401 dialogue box,

Thank You!