弱弱的问，ASP.net2.0里面的CreateUserWizard以及其他的MemberShip相关的东东怎样使用？

看了SDK的QuickStart还是不懂。CreateUser.aspx
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<%@ Page Language="C#" MasterPageFile="~/Site.master"%><asp:Content ID="Content1" ContentPlaceHolderId="MainBody" runat="server">
  <asp:CreateUserWizard ID="CreateUserWizard1" runat="server" continuedestinationpageurl="Home.aspx"/><br />
  <a href="Home.aspx">Return to Default Home Page</a><br />
  <a href="HomeLoginView.aspx">Return to LoginView Home Page</a><br />
  <a href="HomeChangePassword.aspx">Return to ChangePassword Home Page</a><br />
</asp:Content>Site.master
------------------------------------------------------------------------------<%@ Master Language="C#" %>
<html>
  <head runat="server" id="Head1">
    <title>
      Using Site Navigation Controls</title>
  </head>
  <body>
    <form id="form1" runat="server">
      <table style="background-color: blue" cellspacing="0" cellpadding="5" border="0" height="80%">
        <tr height="20px">
          <td style="width: 100px">
            <img id="Img1" src="Images/microsoft.gif"  runat="server"/>
          </td>
          <td style="width: 100px">
            <img id="Img2" src="Images/homeadvisor.gif" runat="server" />
          </td>
          <td style="width: 80px; background-color: white" align="center">
            <asp:loginstatus ID="loginstatus" runat="server"/>
          </td>
        </tr>
        <tr>
          <td style="width: 100px" valign="top">
            &nbsp;</td>
          <td style="background-color: white;padding-left:25;padding-top:15" colspan="2" valign="top">
            <asp:ContentPlaceHolder ID="MainBody" runat="server" />
          </td>
        </tr>
      </table>
    </form>
  </body>
</html>到底它们在什么时候定义了input和label的控件？在访问CreateUser.aspx的时候，有这些控件出现的哦
谢谢