An in-between page with an empty form that submits onLoad to the desired
destination page will work. The user will go from (e.g.) StartPage.html to
BetweenPage.html to DestinationPage.html and not ever see
BetweenPage.html. If he/she clicks the Back button while in
DestinationPage.html, the appearance will be of not being able to go back.
In reality, he/she went to BetweenPage.html which ran the Javascript
function to submit the form which has DestinationPage.html as the Action.
BetweenPage.html has minimal code, something like this:
<html>
<head>
<script language=Javascript>
function NilBack() {
document.form1.submit();
}
</script>
</head>
<body onLoad="NilBack();">
<form name="form1" method="Post" action="DestinationPage.html">
<input type="Hidden" name="Nada" value="Hello">
</form>
</body>
</html>
I tested this, it should work for you.