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When a user wants to watch one of your registered data values, the framework will call your provider interface DataProviderWatchValue function. From that point on when your data value changes you need to call DataSetValueDataSetValueOld to inform the framework of the change.
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- Register a data provider with DataRegisterDataProviderV1 or DataRegisterDataProviderV2
- Implement the appropriate DataProviderInterfaceV1 or DataProviderInterfaceV2 interface to response to respond to the DataProviderSetControlValue function
- Register a control value with DataRegisterControl
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