How to modify the Commerce Server 2002 Login.aspx Web page to no longer require that you specify a domain when you enter your credentials

<%@ Page language="vb" %>
<%@ Import Namespace="Microsoft.CommerceServer.Runtime" %>
<%@ Import Namespace="Microsoft.CommerceServer.Runtime.Profiles" %>
<script language="vb" runat="server">
	Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) 
Handles MyBase.Load
        If Not (CommerceContext.Current Is Nothing) Then
            If Not (CommerceContext.Current.AuthenticationInfo Is Nothing) Then
                Dim url As String

                If (CommerceContext.Current.AuthenticationInfo.IsAuthenticated()) 
Then
                    ' In a Web farm scenario, retrieve the userid from the profile service.
                    Dim userpassword As String = 
getPassword(CommerceContext.Current.AuthenticationInfo.AuthTicket.UserID)

                    ' For custom authentication, examine the validity of the password.
                    ' if you are using Windows authentication, you do no have to verify the password.
                    ' Therefore, let access control lists (ACLs) handle permissions.
                    ' Add in VerifyPassword for custom authentication if you have to.
                    ' If (VerifyPassword(UserID.Text, userpassword)) Then
                    If (Request.Cookies("MSCSFirstRequestedURL") Is Nothing) Then
                        url = 
CommerceContext.Current.QueryStringBuilder.BuildUrl("default.aspx", False)
                    Else
                        url = 
Server.UrlDecode(Request.Cookies("MSCSFirstRequestedURL").Value)
                    End If

                    ' For Windows authentication:
                     'url = constructUrl(url, 
CommerceContext.Current.AuthenticationInfo.AuthTicket.UserID, userpassword)
                     'Changed to pull the password from the password box instead of the authticket.
                     url = constructUrl(url, 
CommerceContext.Current.AuthenticationInfo.AuthTicket.UserID, password.Text)

                    'Response.Redirect(url, False)
                    Response.Redirect(url)
                    'Else
                    '    Label5.Text = "Logon failed for user:  " + 
CommerceContext.Current.AuthenticationInfo.AuthTicket.UserID
                    'End If

                Else
                    If (UserID.Text.Length > 0) Then
                        ' For custom authentication, examine the validity of the password.
                        ' If you are using Windows authentication, you do not have to verify the password.
                        ' Therefore, let ACLs handle permissions.
                        ' Add in VerifyPassword if you have to.
                        'If (VerifyPassword(UserID.Text, Password.Text)) Then
                        ' Set the authticket.
                        ' Added so the authticket matches the logged-on user.
                        dim domainuserid as string = "pts0\" & UserID.Text
                        
CommerceContext.Current.AuthenticationInfo.SetAuthTicket(domainuserid, True, 90)

                        ' The credentials have been submitted. Use this code to pass the credentials
                        ' to the filter for custom authentication.
                        If (Request.Cookies("MSCSFirstRequestedURL") Is Nothing) 
Then
                            url = 
CommerceContext.Current.QueryStringBuilder.BuildUrl("default.aspx", False)
                        Else
                            url = 
Server.UrlDecode(Request.Cookies("MSCSFirstRequestedURL").Value)
                        End If
                        ' For Windows authentication:
                        url = constructUrl(url, UserID.Text, password.Text)

                        ' Redirect to the originally requested page.
                        'Response.Redirect(url, False)  This does not work.  
                        Response.Redirect(url)
                        'Else
                        '    Label5.Text = "Logon failed for user:  " + 
UserID.Text
                        'End If
                    End If

                    UserID.Text = ""
                    Password.Text = ""
                End If
                ' Else display the page to let user enter credentials.
            Else
                Response.Redirect("error.aspx", False)
            End If
        Else
            Response.Redirect("error.aspx", False)
        End If
    End Sub

    Private Function constructUrl(ByVal url As String, ByVal userid As String, 
ByVal password As String) As String
        ' Construct the URL to return to the requested page and then pass
        ' the credentials to the filter.
        Dim urlRet(5) As String

        urlRet(0) = url
        'urlRet(1) = "&proxyuser="
								' Note: <DomainName> is a placeholder of the domain name.
        urlRet(1) = "proxyuser=<DomainName>\" 
        urlRet(2) = userid
        urlRet(3) = "&proxypwd="
        urlRet(4) = password

        constructUrl = String.Concat(urlRet)
    End Function

    Private Function getPassword(ByVal userid As String) As String
        ' Retrieve the password from the profile service.
        Dim password As String
        password = ""
        Dim userProfile As Profile
        userProfile = 
CommerceContext.Current.ProfileSystem.GetProfile("logon_name", userid, 
"UserObject")

        If Not (userProfile Is Nothing) Then
            password = 
userProfile("GeneralInfo.user_security_password").Value.ToString()
        End If

        getPassword = password
    End Function

    Private Function VerifyPassword(ByVal userid As String, ByVal password As 
String) As Boolean
        ' Retrieve the password from the profile service.
        Dim userPassword As String
        Dim returnVal As Boolean
        returnVal = False
        userPassword = ""
        Dim userProfile As Profile
        userProfile = 
CommerceContext.Current.ProfileSystem.GetProfile("logon_name", userid, 
"UserObject")

        If Not (userProfile Is Nothing) Then
            userPassword = 
userProfile("GeneralInfo.user_security_password").Value.ToString()
            If (String.Compare(userPassword, password) = 0) Then
                returnVal = True
            End If
        End If

        VerifyPassword = returnVal
    End Function
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
	<HEAD>
		<title ID=L_Login_HTMLTitle>Login</title>
		<meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
		<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" 
content="http://schemas.microsoft.com/intellisense/ie5">
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="login" method="post" runat="server">
			<TABLE>
				<TR>
					<TD>
					<asp:Label id="L_LoginFormLabel_Text"  runat="server" Font-Bold="True" 
Font-Size="XX-Large" Font-Italic="True">CS2002 Login Form</asp:Label>
					</TD>
				</TR>
				<TR>
					<TD>
					<asp:Label id="L_UserIDLabel_Text"  runat="server" Font-Bold="True" 
Font-Size="Larger">UserID</asp:Label>
					</TD>
					<TD>
					<asp:TextBox id="UserID"  runat="server"></asp:TextBox>
					</TD>
				</TR>
				<TR>
					<TD>
					<asp:Label id="L_PasswordLabel_Text"  runat="server" Font-Bold="True" 
Font-Size="Larger">Password</asp:Label>
					</TD>
					<TD>
					<asp:TextBox id="Password"  runat="server" 
TextMode="Password"></asp:TextBox>
					</TD>
				</TR>
				<TR>
					<TD>
					<asp:Button id="Submit"  runat="server" Text="Submit"></asp:Button>
					</TD>
				</TR>
				<TR>
					<TD>
					<asp:Label id="L_LoginPrompt_Text"  runat="server" Font-Bold="True">To access 
authenticated content, enter your UserID and Password</asp:Label>
					</TD>
				</TR>
				<TR>
					<TD>
					<asp:Label id="Label5"  runat="server" Font-Bold="True" 
Font-Italic="True"></asp:Label>
					</TD>
				</TR>
			</TABLE>
		</form>
	</body>
</HTML>