A method is disclosed wherein a source referring users to an on-line retailer is uniquely identified to the on-line retailer every time the user visits the on-line retailer’s web site. The touch panel comprises a substrate, multiple first inductive electrode strings, multiple second inductive electrode strings, multiple first spacing lines, and multiple second spacing lines. The present system further generates a virtual biological organ virtually constructed in a computer system using the times-series reference data. The device is advantageously designed so that when grasped or picked up, the fingers of the user’s hand lay over touch sensors. A nut rotational member is provided for imparting rotational motion to nut. Melamine is then reacted with the resulting bis- phosphoric acid to form a product of melamine salt thereof.