A system is provided for rapidly prototyping monolithic microwave integrated circuit modules to provide an experimental structure that can be physically made to operate by stereolithographically rendering an SLA part directly from the designer’s drawings and by coating the part with a conductive layer, with the smoothness being better than 0. A drive device reads picture data from the DVD-RAM. Communications over a device are tracked. A third stage may include a string DAC with an impedance string with a set of corresponding switches. The watermark is used to determine authorized entry. The virtual contact card and contact channels may be selected from what have been previously registered, either by the user or a third person, with the service provider and stored in the user’s account, or just newly created, updated, and sent from the user at the time of transmission request to the designated recipients.