1. A method of operating a computer system for producing process control signals to control an external process control system including the steps of: (a) providing first storage means for storing (1) pre-stored control parameters defining a plurality of instruction data scripts, and (2) predetermined process variables defining a plurality of process variable agenda; (b) establishing second storage means for receiving and storing specified input parameters from said external process control system; (c) establishing command processor means for accepting user input command signals and outputting processor control signals for execution at user determined time intervals; (d) concurrently processing (1) said stored specified input parameters from said second storage means; (2) said pre-stored control parameters in a predetermined manner to provide a first command signal and (3) said predetermined process variables in a predetermined manner to provide a second command signal, said step of concurrently processing including the step of inserting said processor control signals to said concurrently processing prestored control parameters and said process variables, said step of processing said pre-stored control parameters further including the step of providing scheduling means coupled to said first storage means for prioritizing said pre-stored control parameters; and, (e) executing said first and second command signals for producing output control signals for control of said external process control system.