20. A system in accordance with claim 18 wherein the memory address of the status data for a signal may be used to compute where within a separate memory storage location a linkage of identifiers linked to that variable data begins in the system memory.
18. A system in accordance with claim 17 which includes means for establishing a trigger linkage to at least one job definition is established by linking the identifier for that job definition to locations in said memory that are in turn linked to the event definition and status data for the designated triggering signals, and wherein means for initiating execution include means for transferring the identifiers linked to the event definition and status data for a signal to means for scheduling the execution of job definitions.