Methods for forming vias in glass substrates by laser drilling and acid etching are disclosed. The VMM may generate a message to the VM that currently owns the physical device and inform the device that the physical device is shutting down. A processing unit associated with the identification member then is able to uniquely identify the particular object which is engaged with the identification member by means of an electrical signal generated by the processing unit. In the open position the two through holes are in alignment with the two input and output ports.