Gets a value that specifies whether any UI Automation client application is subscribed to UI Automation events.
取得值，这个值指定是否有任何UI自动化用户端应用程序订阅ui自动化事件。
OPC Data Access (DA) primarily provides vertical data integration and interoperability between measurement and automation systems on the manufacturing floor and client application.
主要是提供现场层和应用软件间的纵向的数据集成和互操作。
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