How can I click on a web page element and get my app to auto grab the source code?

I'm trying to create a web app that is able to use a webbrowser and then load a web page into the window...only when I click on an element the app will grab it's id, name, or href and save it to a master list much like those apps where you can teach your application to remember tags for later use so that you can automatic the program?

Any clues? Sorry I don't have any source code to toss up yet because I haven't found a way to get started. If you can toss me a bone I might be able to run with it.


Thanks