Virtual machines within a network computing environment negotiate among themselves with regard to the sharing of resources via respective resource managers. The enabling circuits can then enable one or more first memory cells based on the first address-selection and first readwrite information, and further enable the one or more second memory cells based on the second address-selection information and readwrite information. A first set of spacers is formed on the sidewalls. An appropriate type and level of operator assistance is generated based on this threat assessment. Each of the phase-change memory cells of each of the phase-change memory cell groups comprises a plurality of control transistors formed on different layers, and a variable resistance device formed of a phase-change material. A host board connector is positioned at the closed end of each receptacle.