Fetching logged on user name from web application

IS it possible to get the windows LogOn username of client from web application. and how does this actually works

Request.ServerVariables("LOGON_USER") also not works in this case as I don't want user to authenicate first

While

Dim ident As Wind开发者_JAVA百科owsIdentity = WindowsIdentity.GetCurrent()

this is windows specific which gives the user where the code is?

How should I go with this.

found what I want Context.Request.LogonUserIdentity.Name gives the logon user name..