When a user executes an Action, a complete description of that Action is stored in his local database (this is an option). These Actions are not communicated with other users. This Action trail describes, without loss of information, the entire history of the user's behaviour. It forms a database that could be mined for all sorts of purposes, such as learning from the user's behaviour to automatically configure his system. Aggregated over many users, we have a pool of behavioural information that could be very useful for all kinds of analysis. Obviously, this creates a market for data, where, for once, the originators of that data - the end users - have the upper hand. Contrast this with the barely legal data collecting executed by many of the big names on the web!