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Apart from 90 days currency of the crew that must be monitored by operators (click here for more information, section 'Cockpit crew status') some operators have to track that the crew have flown at least once in the last 28 (Europe) or 30 (Asia) days - that includes 'Simulator' flights.
You can easily check if a particular crew member has flown in the required period of time by going to the section Crew Duties table and hover the mouse over the status-dot. Make sure that in the filter the checkbox '28 days currency (cockpit) is ticked (see below).
Leon will update 28/30 days currency if 1 of the below requirements is fulfilled: