6 Use HTMLFilter 13-14 Any incoming request to /_comment/ we handle internally 16 Request other than /_comment/: 16 Let the request be filtered by HTMLFilter 20-24 Before : 26 Add any comments associated with the PATH_INFO 31-38 Add in a form that submits to /_comment/ with path_info=PATH_INFO 40 Requests to /_comment/ go to comment_app(): 41-43 Get the variables "comment" and "path_info" 44-45 Save the comment into a dictionary keyed by path_info 46-49 Redirect them back to where they came from