Bruce,

Thanks for your reply but that's not what I'm trying to accomplish here. I'm never going to be redirecting from the ASPDNSF site to the DNN site. I'm going to have a couple of custom DNN modules that displays products from the ASPDNSF database into the DNN site. When you click on the product in the custom module, I want to redirect from productlist.aspx  to productdetail.aspx (both in the DNN install) but show the URL as ASPDNSF does.

So on productlist.aspx in the DNN install I'll have a GridView of products, theses products can be ever changing. When you click on the product, it will redirect to productdetail.aspx (also in the DNN install) but I want the URL to say p-productid-productname.aspx (where productid and productname are the id & name of the clicked on product) instead of productdetail.aspx. 

So in essence, I want to rewrite productdetail.aspx to p-1-product-one.aspx, p-2-product-two.aspx, p-3-product-three.aspx...etc depending on what product was selected in the GridView.

Thanks to everyone for their help and I'm sorry I made this so confusing.

Almost - except there is no page called 'productdetail'.   Any DNN page with a Url productdetail.aspx is a virtual Url - it doesn't actually point to any file on the server. 

What you want is

<rule>

   <url>/p-([0-9]*)-(.*)\.aspx(?:\?(.*))?</url>

   <rewrite>/default.aspx?tabid=xx&ProductID=$1</rewrite>

</rule>



Where xx is the tabid of your 'product detail' page in DNN.  Check and copy the other DNN rewrite rules to see if it should be default.aspx, /default.aspx or ~/default.aspx in the rewrite rule.

Finally, this is standard DNN.  It will work with the Url Master module, but it's not necessary to have it (and you would have to instruct Url Master to go straight to siteurls.config rules for those Urls).  Because you're just implementing a rewrite, the standard provider can handle that OK.