您知道只有一个控件可以具有焦点吗?因此，他们不能同时在应用程序上工作" ..也许您可以重新表达您的问题并为我们提供更多背景信息.

You know that only one control can have the focus? Thus they cannot "work on app simultaneously".. maybe you can rephrase your question and give us more context.