In device modeling, usually numerous short simulations are used for curve fitting and parameter extraction. The internal SPICE engine in MBP and MQA is very fast. However, sometimes external HSPICE is required for model card sign-off and benchmark circuit simulation. The simulation speed is slow because license is checked out for each simulation. It takes a lot of time. In HSPICE, it provides Client/Server mode to check out license once for all simulations. This slides demonstrates the steps to use Client/Server mode in MBP and MQA.