Finding the relevant web.config in a MOSS environment

In the process of attempting to write a web-part for MOSS I was attempting to find the web.config in order to register the control as safe. To find the web.config, go to IIS manager, right click on the SharePoint web application, choose properties, then click on the Home Directory tab. You should see a path which goes something like wss\{GUID}. If you paste that into an explorer window, you should see the relevant web.config in the resulting directory...