A radio frequency identification tag is coupled to a circuit board to track the specific operating and environmental conditions of each manufacturing stage as the circuit board passes through the manufacturing stages. A method for establishing a shared browsing experience includes an inviter computer communicating to an invitee computer, via an online messenger communication path, an invitation to establish a co-browsing experience. The pistons move axially to the cylinders via a piston-driving device. An attenuation mechanism is provided for independently attenuating the individual spectral bands.