Content Handlers Content handlers give you an easy way to add your own functionality to WebGUI without having to incur the complexity of assets and URL handlers. Content handlers are given a WebGUI session, so you don't even need to set that up. Content handlers, equal to macros, are the easiest plugin you can write for WebGUI.
URL Handlers WebGUI URL handlers serve the same purpose as a mod_perl handler in Apache. They allow you to attach some arbitrary functionality at a specific URL. For example, you can set up some code to apply WebGUI privileges to a filesystem folder full of files, or you can write a handler that will process SOAP requests using WebGUI's data, without going through WebGUI's normal request cycle.