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Model View Controller in MFC

In Desktop Java applications, Observable and Observer can be used. It is almost equal to Event Driven computing.

Data in spreadsheet

In one place or many places in the application we need to be aware about a system event or an application state change. We'd like to have a standard way of subscribing to listening for system events and a standard way of notifying the interested parties. The notification should be automated after an interested party subscribed to the system event or application state change. There also should be a way to unsubscribe.