Hey William:
I've had the same question too and I never got an answer either. There must be an answer somewhere because all these DNN sites are out there. I'm sure there must be some elegant way to do it in DNN but I can't figure it out. What I finally did was create the following basic HTML in my root directory and named it "default.html":
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<script type="text/javascript">
<!--
window.location = "http://www.myweb.com/dotnetnuke/"
//-->
</script>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Untitled 1</title>
</head>
<body>
</body>
</html>
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I'm sure there must be a more elegant way but I wasn't smart enough to find it.
I hope this helps
Larry