Secure access to inventory data concerning a supplier’s product located at a seller’s premises is provided by tagging units of product with a supplier identifier and a product identifier. A ratio rw of a radius r of the surface of the resin portion to a width w of the pressure generation chamber defined by the vibrating wall is greater than or equal to 0. The configuration file contains a sub-routine that periodically updates the options automatically. A third semiconductor device is mounted to the first and second semiconductor devices using an adhesive. Preferably, the Lightweight Directory Access Protocol is used as an access method when the data repository being accessed is a database storing an LDAP directory.