The zoom lens system is used for forming an optical image of an object with a variable magnification, and, in order from the object side, comprises a first lens unit G1 of negative optical power, a second lens unit G2 of positive optical power and a third lens unit G3 of positive optical power. Availability of an aiding data is first queried about. The parsed content from the email is exposed, automatically and without user intervention, for output in a news feed of the user. A node is defined between two of the first resistor dividers. The digital handshake key can then be used to define a secure communications path between the two devices and share information securely. The device to be authenticated transmits the authentication reply data to the authenticating device.