How do I use Request.ServerVariables in Delphi 2006

I have been given a code snippet from a client to retrieve a users id from their web environment:
sLogin = Request.ServerVariables("HTTP_X_LL_AFF_NTLM");

I have put the following code into my Delphi 2006 code:
sUserName := Request.ServerVariables('HTTP_X_LL_AFF_NTLM')

It will not compile due to 'E2003 Undeclared identifier 'Request' '.
I am obviously missing something.  Please could someone help me.

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Are you actually using ASP components in Delphi? Could you post your snippet?
gms2702Author Commented:
Found alternative method.

      sHttpHeader := GetStringSetting( 'HttpHeader', '' );
      If not ( sHttpHeader.Trim = '' ) Then
        sUserName := CallingPage.Request.ServerVariables[sHttpHeader]
        sUserName := System.Threading.Thread.CurrentPrincipal.Identity.Name.ToString;

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