How to post XML Data a web form on click of Hyper Link

Hi
I have to post an XML Document to a URL (In fact it is a separate application) with HTTP Post and open this application in a new Window on click of a hyper link in ASP.NET. Any one konws how to do this?
<asp:HyperLink runat="server" ID="ltestLink" EnableViewState="false" Text="Click Me >>"  NavigateUrl="" />
Now when i click this link, the other application should be opened in a separate form.Thanks
Dipu