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Status information is returned from the 4MS systems to the 4000 control computer using the same procedure as is described above for instrument control. Status information received by the d-tasks is posted on a 'notice-board' maintained in memory by the ADAM system. Error messages are reported to the observer (usually).
A mimic task is responsible for picking up information from the notice-board and displaying it on the mimic screen. This is a multi-page status display, providing one or more pages of status information for each sub-system. The user determines which page is to be displayed using a mouse and menu.