The error handling facilities ordinarily provided by the Common Lisp Condition System are not present by default in delivered applications. If you choose not to retain the full Condition System, you can make use of the more limited, but smaller, error systems available with Delivery.
Simplified error handling is still possible in Windows applications without the Condition System. They can only trap "conditions" of type ERROR or WARNING . If an application signals any condition other than WARNING or SIMPLE-WARNING , the condition is categorized (and therefore trappable) as one of type ERROR .