Once the machine has booted, BIOS will have a different use, appears to have a standard for computer hardware application programming interface of the DOS system.

一旦机器启动，BIOS就有了不同的用途，显示具有针对电脑硬件的标准应用程序编程接口的DOS系统。

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The application can be written in a different programming language than the service, and run on a different operating system.

编写应用程序的语言可以不同于编写服务的语言，应用程序也可以运行在不同的操作系统中。

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The Microsoft Windows operating system contains an embedded measurement infrastructure that can be accessed either through the Windows Registry or using Application Programming Interfaces (APIs).

Microsoft Windows操作系统包含可以通过Windows Registry或者使用应用程序编程接口(Application Programming Interface, API)来访问的内嵌测量基础架构。

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Jolicloud is a stripped down operating system that, instead of running software, connects to Web services using their application programming interface (API).

FORBES: The Disposable Operating System

Bug-for-bug compatibility is a problem, but breaking backward compatibility would be a much bigger problem, so even as the lowest layers of the operating system are revised and rewritten, the layers that applictions talk to (the application programming interface, or API) are carefully tested to ensure that no changes are visible to the application.

FORBES: What Is So Great About Microsoft?

The state of the art in this model of programming is Pegasystems, which is often called a BPM system but is really a declarative application development environment.

FORBES: A New Open-Source Model For SaaS