A collaboration client’s behavior is changed according to context while collaborating on an internet. The inspection unit includes a backlight with illumination areas located dottedly per predetermined pitch which is capable of illuminating the sachet from backside when photographing. The high-temperature metal marks are formed prior to the formation of the empty-spaced buried patterns formed in a monocrystalline substrate, so that the empty-space buried patterns are aligned to the marks. Each of the cameras is operatively attached to an image processor, which processes the image frames acquired respectively by the camera. The flaps open wide and enable the user to easily manipulate and apply the covering to a headband without any special tools. A sensor senses one or more thermodynamic properties associated with the vessel.