The design parameters are the most important data items in this environment. The main purpose of this system is to keep track of these parameters and notify the subsystems of any changes that occur to any of these parameters. For the system to perform this task, it needs to know the following data:
Table 3: Subsystem notification table according to parameter changes.
Table 3 shows a list of the design parameters along with the subsystem that can change them and the subsystems that should be notified by a change in any of these parameters. Notice that some of these parameters are changed by the CI, this change is accomplished using the update rules. In this figure note that one of the design parameters can be removed from this table, which is ``display rate.'' The removal of this parameter is valid because only one subsystem needs to know about this parameter and it is the same subsystem that can change it. However, we will keep it for possible future extensions or additions of other subsystems that might be interested in this parameter.