As Juan said, ActiveX can be used. Since you are expecting a WINNT login, you can run
a vb script snippet on the client side.
I think the following code may be of some help
<HEAD> <TITLE> </TITLE>
<Script Language="VBScript">
Dim objNet
On Error Resume Next 'if fail to create object then display custom error
Set objNet = CreateObject("WScript.NetWork") 'Create activeX object
currentURL = Document.Location
msgToUsr = "You are not a WINNT authenticated User."
If Err.Number <> 0 Then 'User might have selected No on the ActiveX box
if MsgBox("Please Press the Yes Button in the Browser Warning Window. " & vbcrlf
& " It is required for checking authorization to Access the link you Selected." &
vbcrlf & "Do you want to Continue?", vbYesNo) = vbYes then
Document.Location = currentURL 'show the page again
Else
msgToUsr = "<B>You have Chosen Not to Proceed with this Page</B><br>The scir
pt should be allowed to run inorder to check your WINNT authentication"
End If
'It will display again
Else
Dim strInfo
strInfo = "User Name is " & objNet.UserName & vbCRLF & _
"Computer Name is " & objNet.ComputerName & vbCRLF & _
"DomaIn Name is " & objNet.UserDomain
'The required info is above.
Set objNet = Nothing 'Garbage Collection
End If
</Script>
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