Why does my form data gets cleared out when clicking on the back button.

Can someone explain why does my form selections get cleared out when clicking on the back button.
I have a JSP page that displays a form with some selections and text boxes. I populate the page and submit the request. The action on the submit call another jsp page, which processes the data and displays the results via a <jsp:include> statement which calls the results page. When clicking on the back button from the results page, it returns me to the form page, but the selections are cleared out.
1. Is there something in my calling of the pages that causes this behavior and can I prevent it?
I notice that the behavior is different when using the IE 6.0 version Netscape 7.1. IE clears the page Netscape 7.1 retains the settings.
If I cannot prevent this behavior does that mean I will have to save the state of the form data. And if I have to save the form data, what would be the easiest method of doing this. I'm a beginner to JSP and Java, but have some ASP experience. I don't understand why the back button in a JSP request clears the form data but a regular HTML page does not can someone explain?
THANKS.

the browser doesn't have to remember what you submitted and fill that back in.
you can't prevent it unless you can ensure a new request to the server in which you can fill the default values in there.

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