Where should RequestDispatcher.include() be used ?

Hello again,
I could not get the expected result from RequestDispatcher.include().
First, I cannot use it to include static content; second, it does not include the dynamic contents in proper order.
Now my question is, where can I use RequestDispatcher.include(), or should I use it at all ?
The following are the source files and result on SunOne WebServer6.1 and Tomcat 5.5.12.
IncludeDynamic.jsp
<%@ page import="javax.servlet.RequestDispatcher" %>
<html>
<body>
     <h1>First partition</h1>
     <hr />
     <h2>
<%
     RequestDispatcher rd = application.getRequestDispatcher("/jsp/IncludeHidden.jsp");
     rd.include(request, response);
%>
     </h2>
</body>
</html>
IncludeHidden.jsp
Dynamic Inlcude Content
The following is the HTML I get from the browser,
Dynamic Inlcude Content
<html>
<body>
     <h1>First partition</h1>
     <hr />
     <h2>
     </h2>
</body>
</html>
----------------------------------------------------------------------------------------

Try using
<%@ include file="/jsp/IncludeHidden.jsp" %>
instead of
<% RequestDispatcher rd = application.getRequestDispatcher("/jsp/IncludeHidden.jsp"); rd.include(request, response); %>

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