19. The method of claim 18 wherein said step of deactivation comprises the steps of: generating a deactivate signal by said computer; searching for another one of said tables contained within said control structures that contain a group of instructions by said computer in response to said deactivate signal; storing by said computer a variable signal indicating that said set of instructions containing said second preference group of instructions is to be deactivated in another one of said system states; and stopping said computer from further processing said deactivate signal by said computer executing a group of instructions of said other one of said tables thereby inhibiting the deactivation of said set of instructions associated with said second preference group of instructions
18. The method of claim 16 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 by said computer the one of said tables that corresponds to the state and system signal to which individual groups of instructions respond; and storing by said computer into the determined one of said tables a reference for each of the groups of instructions for which the determination was performed.