1.
Sistema operatiu
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An operating system is system software that manages computer hardware and software resources and provides common services for computer programs. All computer programs, excluding firmware, require a system to function. Operating systems are found on many devices that contain a computer – from cellular phones, the dominant desktop operating system is Microsoft Windows with a market share of around 83. 3%. MacOS by Apple Inc. is in place, and the varieties of Linux is in third position. Linux distributions are dominant in the server and supercomputing sectors, other specialized classes of operating systems, such as embedded and real-time systems, exist for many applications. A single-tasking system can run one program at a time. Multi-tasking may be characterized in preemptive and co-operative types, in preemptive multitasking, the operating system slices the CPU time and dedicates a slot to each of the programs. Unix-like operating systems, e. g. Solaris, Linux, cooperative multitasking is achieved by relying on each process to provide time to the other processes in a defined manner. 16-bit versions of Microsoft Windows used cooperative multi-tasking, 32-bit versions of both Windows NT and Win9x, used preemptive multi-tasking. Single-user operating systems have no facilities to distinguish users, but may allow multiple programs to run in tandem, a distributed operating system manages a group of distinct computers and makes them appear to be a single computer. The development of networked computers that could be linked and communicate with each other gave rise to distributed computing, distributed computations are carried out on more than one machine. When computers in a work in cooperation, they form a distributed system. The technique is used both in virtualization and cloud computing management, and is common in large server warehouses, embedded operating systems are designed to be used in embedded computer systems. They are designed to operate on small machines like PDAs with less autonomy and they are able to operate with a limited number of resources. They are very compact and extremely efficient by design, Windows CE and Minix 3 are some examples of embedded operating systems. A real-time operating system is a system that guarantees to process events or data by a specific moment in time. A real-time operating system may be single- or multi-tasking, but when multitasking, early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the 1950s, such as resident monitor functions that could run different programs in succession to speed up processing
2.
Plataforma (informàtica)
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Computing platform means in general sense, where any piece of software is executed. It may be the hardware or the system, even a web browser or other application. The term computing platform can refer to different abstraction levels, including a hardware architecture, an operating system. In total it can be said to be the stage on which programs can run. For example, an OS may be a platform that abstracts the underlying differences in hardware, platforms may also include, Hardware alone, in the case of small embedded systems. Embedded systems can access hardware directly, without an OS, this is referred to as running on bare metal, a browser in the case of web-based software. The browser itself runs on a platform, but this is not relevant to software running within the browser. An application, such as a spreadsheet or word processor, which hosts software written in a scripting language. This can be extended to writing fully-fledged applications with the Microsoft Office suite as a platform, software frameworks that provide ready-made functionality. Cloud computing and Platform as a Service, the social networking sites Twitter and facebook are also considered development platforms. A virtual machine such as the Java virtual machine, applications are compiled into a format similar to machine code, known as bytecode, which is then executed by the VM. A virtualized version of a system, including virtualized hardware, OS, software. These allow, for instance, a typical Windows program to run on what is physically a Mac, some architectures have multiple layers, with each layer acting as a platform to the one above it. In general, a component only has to be adapted to the layer immediately beneath it, however, the JVM, the layer beneath the application, does have to be built separately for each OS
3.
Llicència de programari
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A software license is a legal instrument governing the use or redistribution of software. Under United States copyright law all software is copyright protected, in code as also object code form. The only exception is software in the public domain, most distributed software can be categorized according to its license type. Two common categories for software under copyright law, and therefore with licenses which grant the licensee specific rights, are proprietary software and free, unlicensed software outside the copyright protection is either public domain software or software which is non-distributed, non-licensed and handled as internal business trade secret. Contrary to popular belief, distributed unlicensed software is copyright protected. Examples for this are unauthorized software leaks or software projects which are placed on public software repositories like GitHub without specified license. As voluntarily handing software into the domain is problematic in some international law domains, there are also licenses granting PD-like rights. Therefore, the owner of a copy of software is legally entitled to use that copy of software. Hence, if the end-user of software is the owner of the respective copy, as many proprietary licenses only enumerate the rights that the user already has under 17 U. S. C. §117, and yet proclaim to take away from the user. Proprietary software licenses often proclaim to give software publishers more control over the way their software is used by keeping ownership of each copy of software with the software publisher. The form of the relationship if it is a lease or a purchase, for example UMG v. Augusto or Vernor v. Autodesk. The ownership of goods, like software applications and video games, is challenged by licensed. The Swiss based company UsedSoft innovated the resale of business software and this feature of proprietary software licenses means that certain rights regarding the software are reserved by the software publisher. Therefore, it is typical of EULAs to include terms which define the uses of the software, the most significant effect of this form of licensing is that, if ownership of the software remains with the software publisher, then the end-user must accept the software license. In other words, without acceptance of the license, the end-user may not use the software at all, one example of such a proprietary software license is the license for Microsoft Windows. The most common licensing models are per single user or per user in the appropriate volume discount level, Licensing per concurrent/floating user also occurs, where all users in a network have access to the program, but only a specific number at the same time. Another license model is licensing per dongle which allows the owner of the dongle to use the program on any computer, Licensing per server, CPU or points, regardless the number of users, is common practice as well as site or company licenses
4.
Lloc web
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A website is a collection of related web pages, including multimedia content, typically identified with a common domain name, and published on at least one web server. A website may be accessible via a public Internet Protocol network, such as the Internet, or a local area network. Websites have many functions and can be used in various fashions, a website can be a website, a commercial website for a company. Websites are typically dedicated to a topic or purpose, ranging from entertainment and social networking to providing news. All publicly accessible websites collectively constitute the World Wide Web, while private websites, Web pages, which are the building blocks of websites, are documents, typically composed in plain text interspersed with formatting instructions of Hypertext Markup Language. They may incorporate elements from other websites with suitable markup anchors, Web pages are accessed and transported with the Hypertext Transfer Protocol, which may optionally employ encryption to provide security and privacy for the user. The users application, often a web browser, renders the page content according to its HTML markup instructions onto a display terminal. Hyperlinking between web pages conveys to the reader the site structure and guides the navigation of the site, Some websites require user registration or subscription to access content. As of 2016 end users can access websites on a range of devices, including desktop and laptop computers, tablet computers, smartphones, the World Wide Web was created in 1990 by the British CERN physicist Tim Berners-Lee. On 30 April 1993, CERN announced that the World Wide Web would be free to use for anyone, before the introduction of HTML and HTTP, other protocols such as File Transfer Protocol and the gopher protocol were used to retrieve individual files from a server. These protocols offer a directory structure which the user navigates and chooses files to download. Documents were most often presented as text files without formatting. Websites have many functions and can be used in various fashions, a website can be a website, a commercial website. Websites can be the work of an individual, a business or other organization, any website can contain a hyperlink to any other website, so the distinction between individual sites, as perceived by the user, can be blurred. Websites are written in, or converted to, HTML and are accessed using a software interface classified as a user agent. Web pages can be viewed or otherwise accessed from a range of computer-based and Internet-enabled devices of various sizes, including computers, laptops, PDAs. A website is hosted on a system known as a web server. These terms can refer to the software that runs on these systems which retrieves
5.
Projecte GNU
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The GNU Project /ɡnuː/ is a free-software, mass-collaboration project, first announced on September 27,1983 by Richard Stallman at MIT. GNU software guarantees these freedom-rights legally, and is free software. In order to ensure that the software of a computer grants its users all freedom rights, even the most fundamental and important part. Stallman decided to call this operating system GNU, basing its design on that of Unix, development was initiated in January 1984. In 1991, the kernel Linux appeared, developed outside of the GNU project by Linus Torvalds, combined with the operating system utilities already developed by the GNU project, it allowed for the first operating system that was free software, known as Linux or GNU/Linux. The projects current work includes development, awareness building, political campaigning and sharing of the new material. Richard Stallman announced his intent to start coding the GNU Project in a Usenet message in September 1983, when the GNU project first started they had an Emacs text editor with Lisp for writing editor commands, a source level debugger, a yacc-compatible parser generator, and a linker. The GNU system required its own C compiler and tools to be free software, by June 1987, the project had accumulated and developed free software for an assembler, an almost finished portable optimizing C compiler, an editor, and various Unix utilities. They had a kernel that needed more updates. Once the kernel and the compiler were finished, GNU was able to be used for program development, the main goal was to create many other applications to be like the Unix system. GNU was able to run Unix programs but was not identical to it, GNU incorporated longer file names, file version numbers, and a crashproof file system. The GNU Manifesto was written to support and participation from others for the project. Programmers were encouraged to take part in any aspect of the project that interested them, people could donate funds, computer parts, or even their own time to write code and programs for the project. The origins and development of most aspects of the GNU Project are shared in a narrative in the Emacs help system. It is the detailed history as at their web site. The GNU Manifesto was written by Richard Stallman to gain support, to implement these freedoms, users needed full access to code. Although most of the GNU Projects output is technical in nature, it was launched as a social, ethical, as well as producing software and licenses, the GNU Project has published a number of writings, the majority of which were authored by Richard Stallman. The GNU project uses software that is free for users to copy, edit and it is free in the sense that users can change the software to fit individual needs
