你只看到单独的被调用的应用程序菜单。
You'll only see separate application menus if they're needed.
被调用的应用程序能够通过ASSIGN CHANNEL知道管道将在何时被传递给它。
A called application can know when a channel is passed to it by using the ASSIGN channel API.
功能存根，当它被调用时，访问一个中间件层，该层向被调用的应用程序传输调用及其相关的数据。
The function stub, when called, accesses a middleware layer that transports the call and its associated data to the invoked application.
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