在呼叫程序与被呼叫程序之间需要媒介的情况下，委派相当有用。

Delegates are useful in situations where you need an intermediary between a calling procedure and the procedure being called.

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呼叫被取消，因为通讯设备驱动程序关闭了此线路。

Your call was canceled because the telephony device driver closed the line.

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指示指标参数从被呼叫的程序传回到呼叫程序(从伺服器到用户端)。

Indicates that the pointer parameter is returned from the called procedure to the calling procedure (from the server to the client).

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