The knowledge or role that makes a person an accessory under the Barnes v Addy principle

What is constructive notice? Should the five types of knowledge propounded in Baden v Societe Generale SA continue to be applied? Is 'knowing receipt' a mere example of 'knowing assistance'? What is the basis of liability for 'knowing assistance/knowing receipt'? Is liability for 'knowing assistance/knowing receipt' excluded from the Torrens System by the principle of the indefeasibility of a registered title? This paper will attempt to answer these questions.