21. The method of claim 15 wherein each of said control structures is associated with one of said system states and each of said control structures comprises a plurality of tables each associated with one of said system signals occurring in the system state of the associated control structure, said storing step comprises the steps of: determining the one of said tables that corresponds to the state and system signal response of each individual group of instructions by said computer; and storing by said computer into the determined one of said tables a reference for the group of instructions for which the determination was performed.
21. The method of claim 15 wherein each of said control structures is associated with one of said system states and each of said control structures comprises a plurality of tables each associated with one of said system signals occurring in the system state of the associated control structure, said storing step comprises the steps of: determining the one of said tables that corresponds to the state and system signal response of each individual group of instructions by said computer; and storing by said computer into the determined one of said tables a reference for the group of instructions for which the determination was performed. 22. The method of claim 21 wherein said step of allowing comprises the step of obtaining the reference to said second highest preference group of instructions from the table containing said first preference group of instruction contained in the control structure of the present system state by said computer; and executing said second highest preference group of instructions by said computer.