Now the part where we tie the GUI design to the program functionality we'll add in the source code.

现在，可以把GUI设计与我们将要在源代码中添加的程序功能联系起来了。

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To facilitate this, 4gls typically provide graphical editors to visually design the GUI and proprietary scripting languages and APIs to tie user-driven events to specific business logic.

为此，4gl通常提供图形编辑器来支持以可视方式设计GUI，并提供专有脚本语言和API来将用户驱动的事件绑定到特定业务逻辑。

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For example, you might use this approach to tie together HTTP and SIP sessions to monitor a phone call or to start a phone call through a rich HTTP graphical user interface (GUI).

例如，您可以使用这种方法来将HTTP和SIP会话绑定到一起，以监视电话呼叫或启动富HTTP图形用户界面(Graphical User Interface, GUI)。

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