give some clues about how error handling works now

components/README

@@ -35,3 +35,11 @@ $session->data		array for storing persistant data
 
 any values stored in data[] will be persistant between pages
 for as long as the users session cookie stays active.
+
+For error handling, your component should use the trigger_error() function:
+
+trigger_error("Informational message", E_USER_INFO); // To inform the user that something happened, e.g. the session expired
+trigger_error("Warning message", E_USER_WARNING); // Warn the user of an expected error, e.g. incorrect password
+trigger_error("Error message", E_USER_ERROR); // Reserved for unexpected conditions, e.g. unable to connect to database
+
+You may also use the message_flash("status message") function for helpful messages, e.g. form submitted