computer science

Operating environment

Operating environment is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Operating environment rather than just read about it. In short: In computer software, an operating environment or integrated applications environment is the environment in which users run application software. The environment consists of a user interface provided by an applications manager and usually an application programming interface (API) to the applications manager.

Key takeaways

Operating environment belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Operating environment to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Operating environment from memory before moving on to harder problems.

Reference excerpt

In computer software, an operating environment or integrated applications environment is the environment in which users run application software. The environment consists of a user interface provided by an applications manager and usually an application programming interface (API) to the applications manager. An operating environment is not a full operating system, but is a form of middleware that rests between the OS and the application. For example, the first version of Windows, Windows 1.0, was not a full operating system, but a GUI laid over MS-DOS albeit with an API of its own. Similarly, the IBM U2 system operates on both Unix/Linux and Windows NT. Usually the user interface is text-based or graphical, rather than a command-line interface (e.g., the Unix shell), which is often the interface of the underlying operating system. In the mid 1980s, text-based and graphical user interface operating environments surrounded the MS-DOS operating system with a shell that turned the user's display into a menu-oriented "desktop" for selecting and running IBM PC compatible applications. These operating environment systems allow users much of the convenience of integrated software without locking them into a single package.

History In the mid 1980s, text-based and graphical user interface operating environments such as IBM TopView, Windows, Digital Research's GEM Desktop, GEOS and Quarterdeck Office Systems's DESQview surrounded the MS-DOS operating system with a shell that turned the user's display into a menu-oriented "desktop" for selecting and running IBM PC compatible applications. These programs were more than simple menu systems—as alternate operating environments they were substitutes for integrated programs such as Framework and Symphony, that allowed switching, windowing, and cut-and-paste operations among dedicated applications. These operating environment systems gave users much of the convenience of integrated software without locking them into a single package. Alternative operating environments made terminate-and-stay-resident pop-up utilities such as Borland Sidekick redundant. Windows provided its own version of these utilities, and placing them under central control could eliminate memory conflicts that RAM-resident utilities create. In later versions, Windows evolved from an operating environment into a complete operating system with MS-DOS as a bootloader (Windows 3.1 and Windows 9x) and a cleanroom operating system, Windows NT, was developed at the same time. All versions after Windows ME have been based on the Windows NT kernel.

See also Desktop environment, the graphical user interface to the computer File manager Integrated environment Integrated development environment, a type of computer software that assists computer programmers in developing software Runtime environment, a virtual machine state which provides software services for processes or programs while a computer is running X Window System

References

Worked examples

Example 1 — a first encounter with Operating environment

Start with the simplest possible case. Write down what Operating environment claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Operating environment before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Operating environment ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Operating environment

In research: Operating environment appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Operating environment in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Operating environment is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computing terminology, Middleware, Operating system APIs, so understanding it makes those chapters shorter.
In everyday life: Look for Operating environment outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Operating environment in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Operating environment means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Operating environment out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Operating environment in simple terms?

Why does Operating environment matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Operating environment?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Operating environment.