[hunchentoot-devel] Why override the standard dispatcher?

Newbie question. Can anyone explain why people would want to override the standard dispatcher? E.g. in http://www.lispcast.com/files/episode3/reddit-lisp.lisp (defclass handler () ((url :initarg :url :accessor url :type string) (handler :initarg :handler :accessor handler) (name :initarg :name :accessor name :type symbol))) (defvar *handlers* (make-hash-table)) (defun our-handler (request) (let ((handler (gethandler (hunchentoot:script-name request)))) (when handler (handler handler)))) (setf hunchentoot:*dispatch-table* (list 'our-handler))