A system, methods, and apparatus for performing automobile transactions are disclosed. The invention also considers the rendering from the client appliance perspective and the server appliance perspective. The linear light source further includes resin seal layers 10 which are in the form of a trapezoidal prism or a truncated pyramid and formed by filling recesses, each of which is defined by the printed board 4, light emitting element 5 and reflectors 6, with a light-transmissive resin sealant. When the contact has high availability, the presence system displays an increasing animation.