A magnetic detection system for authenticating a document includes a first magnetic scanhead adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills. The server receives, from a client, a request for a list of conversations associated with the user and sends, to the client, display information for displaying a list of conversations comprising a set of rows, each conversation in the list of conversations being represented as a single row. The assembly is adapted to operatively adjust the pivot axis away from the seat of the pressure spring towards the sleeve retainer end of the pressure spring whereby a desired lever ratio is achieved. In addition, the search engine may also determine not only that a file satisfies a query but what version of the file satisfies the query.