What is the icon?

When you look at the properties of a desktop object, you can click on the icon on the first page to change it. However, there's no indication of the filename of the current icon. That leads to several questions: 1. Is there an easy way to find that filename without chasing down directory trees in ~/.kde? 2. Is there an easy way to copy an icon from one desktop application to another? 3. Where do I go to modify the choices that I get when I specify an icon? Paul Abrahams