Reference counting is shared between an in-process service runtime and a machine-wide service. The press machine includes a lower die coupled to an upper die, wherein the lower die includes a top surface supporting a strip of material to be formed into a part after a stripper plate coupled to the upper die contacts the strip of material. Afterwards, the nitride-based etch stop layer is formed on the etched third inter-layer insulation layer, and then, the contact hole for forming the storage node contact plug is formed in between the bit lines through the SAC process so that the etch stop layer does not remain at sidewalls of the bit line. The second VNIC enables a third application outside the customer domain to access the VM in the customer domain.