Dragging items into a browser is pretty well documented, and HTML5 makes this easier.
However, I\'m wondering if and how it\'s possible to drag \'n\
Conceptually Yes, this is possible. But it would be the OS/application handling the drop to decide what to do with it. In fact you can do exactly what you describe with chrome. Open a new chrome window and drag a link to it. It navigates there. Drag a link to your desktop. In Win7 it creates a shortcut/link to that page.
What you are talking about is not HTML drag and drop but actually at an OS/application level. And would have to be handled with an application language, not the browser HTML.