2. The method of claim 1 wherein said plurality of user commands includes an addInstance command that adds an instance of a specified cell to the netlist.
2. The method of claim 1 wherein said plurality of user commands includes an addInstance command that adds an instance of a specified cell to the netlist. 4. The method of claim 2 wherein said plurality of user commands includes an deleteInstance command that deletes an instance of a cell from the netlist.