1.
Access control
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Security, access control is the selective restriction of access to a place or other resource. The act of accessing may mean consuming, entering, or using, permission to access a resource is called authorization. Locks and login credentials are two mechanisms of access control. Geographical access control may be enforced by personnel, or with a such as a turnstile. There may be fences to avoid circumventing this access control, an alternative of access control in the strict sense is a system of checking authorized presence, see e. g. Ticket controller. A variant is exit control, e. g. of a shop or a country, the term access control refers to the practice of restricting entrance to a property, a building, or a room to authorized persons. Physical access control can be achieved by a human, through means such as locks and keys. Within these environments, physical key management may also be employed as a means of managing and monitoring access to mechanically keyed areas or access to certain small assets. Physical access control is a matter of who, where, an access control system determines who is allowed to enter or exit, where they are allowed to exit or enter, and when they are allowed to enter or exit. Historically, this was accomplished through keys and locks. When a door is locked, only someone with a key can enter through the door, mechanical locks and keys do not allow restriction of the key holder to specific times or dates. Mechanical locks and keys do not provide records of the key used on any specific door, when a mechanical key is lost or the key holder is no longer authorized to use the protected area, the locks must be re-keyed. Electronic access control uses computers to solve the limitations of mechanical locks, a wide range of credentials can be used to replace mechanical keys. The electronic access control system grants access based on the credential presented, when access is granted, the door is unlocked for a predetermined time and the transaction is recorded. When access is refused, the door locked and the attempted access is recorded. The system will monitor the door and alarm if the door is forced open or held open too long after being unlocked. When a credential is presented to a reader, the reader sends the information, usually a number, to a control panel. The control panel compares the number to an access control list, grants or denies the presented request
2.
Computer
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A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically. The ability of computers to follow a sequence of operations, called a program, such computers are used as control systems for a very wide variety of industrial and consumer devices. The Internet is run on computers and it millions of other computers. Since ancient times, simple manual devices like the abacus aided people in doing calculations, early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms. More sophisticated electrical machines did specialized analog calculations in the early 20th century, the first digital electronic calculating machines were developed during World War II. The speed, power, and versatility of computers has increased continuously and dramatically since then, conventionally, a modern computer consists of at least one processing element, typically a central processing unit, and some form of memory. The processing element carries out arithmetic and logical operations, and a sequencing, peripheral devices include input devices, output devices, and input/output devices that perform both functions. Peripheral devices allow information to be retrieved from an external source and this usage of the term referred to a person who carried out calculations or computations. The word continued with the same meaning until the middle of the 20th century, from the end of the 19th century the word began to take on its more familiar meaning, a machine that carries out computations. The Online Etymology Dictionary gives the first attested use of computer in the 1640s, one who calculates, the Online Etymology Dictionary states that the use of the term to mean calculating machine is from 1897. The Online Etymology Dictionary indicates that the use of the term. 1945 under this name, theoretical from 1937, as Turing machine, devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick, later record keeping aids throughout the Fertile Crescent included calculi which represented counts of items, probably livestock or grains, sealed in hollow unbaked clay containers. The use of counting rods is one example, the abacus was initially used for arithmetic tasks. The Roman abacus was developed from used in Babylonia as early as 2400 BC. Since then, many forms of reckoning boards or tables have been invented. In a medieval European counting house, a checkered cloth would be placed on a table, the Antikythera mechanism is believed to be the earliest mechanical analog computer, according to Derek J. de Solla Price. It was designed to calculate astronomical positions and it was discovered in 1901 in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to circa 100 BC
3.
Identity document
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An identity document is any document which may be used to prove a persons identity. If issued in a small, standard credit card size form, some countries issue formal identity documents, while others may require identity verification using informal documents. When the identity document incorporates a persons photograph, it may be called photo ID, in the absence of a formal identity document, a drivers license may be accepted in many countries for identity verification. Some countries do not accept drivers licenses for identification, often because in countries they do not expire as documents. Most countries accept passports as a form of identification, some countries require all people to have an identity document available at any time. Many countries require all foreigners to have a passport or occasionally a national identity card from their country available at any time if they do not have a permit in the country. The identity document is used to connect a person to information about the person, the photo and the possession of it is used to connect the person with the document. A unique national identification number is the most secure way, a version of the passport considered to be the earliest identity document inscribed into law was introduced by King Henry V of England with the Safe Conducts Act 1414. For the next 500 years and before World War I, most people did not have or need an identity document, both Australia and Great Britain, for example, introduced the requirement for a photographic passport in 1915 after the so-called Lody spy scandal. The shape and size of identity cards were standardized in 1985 by ISO/IEC7810, some modern identity documents are smart cards including a difficult-to-forge embedded integrated circuit, that were standardized in 1988 by ISO/IEC7816. New technologies allow identity cards to contain information, such as photographs, face, hand or iris measurements. Electronic identity cards are available in countries including Belgium, Croatia, Estonia, Finland, Guatemala, Hong Kong, Malaysia, Morocco, Portugal. Law enforcement officials claim that identity cards make surveillance and the search for criminals easier, in countries that dont have a national identity card, there is, however, concern about the projected large costs and potential abuse of high-tech smartcards. There is debate in these countries about whether such cards and their centralised database would constitute an infringement of privacy, most criticism is directed towards the enhanced possibilities of extensive abuse of centralised and comprehensive databases storing sensitive data. None of the countries listed above mandate possession of identity documents, for example, all vehicle drivers must have a driving licence, and young people may need to use specially issued proof of age cards when purchasing alcohol. Arguments for identity documents as such, In order to avoid mismatching people, Every human being already carries their own personal identification in the form of DNA, which is extremely hard to falsify or to discard. For example, in Sweden private companies such as banks refused to issue ID cards to individuals without a Swedish card and this forced the government to start issuing national cards. It is also hard to control information usage by private companies
4.
Fingerprint
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A fingerprint in its narrow sense is an impression left by the friction ridges of a human finger. The recovery of fingerprints from a scene is an important method of forensic science. Fingerprints are easily deposited on surfaces by the natural secretions of sweat from the eccrine glands that are present in epidermal ridges. These are sometimes referred to as Chanced Impressions, in a wider use of the term, fingerprints are the traces of an impression from the friction ridges of any part of a human or other primate hand. A print from the sole of the foot can also leave an impression of friction ridges, deliberate impressions of fingerprints may be formed by ink or other substances transferred from the peaks of friction ridges on the skin to a relatively smooth surface such as a fingerprint card. Fingerprint records normally contain impressions from the pad on the last joint of fingers and thumbs, human fingerprints are detailed, nearly unique, difficult to alter, and durable over the life of an individual, making them suitable as long-term markers of human identity. Fingerprint analysis, in use since the early 20th century, has led to many crimes being solved and this means that many criminals consider gloves essential. In 2015, the identification of sex by use of a fingerprint test has been reported. A friction ridge is a portion of the epidermis on the digits. These are sometimes known as epidermal ridges which are caused by the interface between the dermal papillae of the dermis and the interpapillary pegs of the epidermis. These ridges may also assist in gripping surfaces and may improve surface contact in wet conditions. Before computerisation, manual filing systems were used in large fingerprint repositories, manual classification systems were based on the general ridge patterns of several or all fingers. This allowed the filing and retrieval of paper records in large collections based on friction ridge patterns alone, the most popular systems used the pattern class of each finger to form a key to assist lookup in a filing system. Classification systems include the Roscher system, the Juan Vucetich system, in the Henry system of classification, there are three basic fingerprint patterns, loop, whorl, and arch, which constitute 60–65%, 30–35%, and 5% of all fingerprints respectively. Ulnar loops start on the pinky-side of the finger, the closer to the ulna. Radial loops start on the thumb-side of the finger, the closer to the radius. Whorls may also have sub-group classifications including plain whorls, accidental whorls, double loop whorls, peacocks eye, composite, other common fingerprint patterns include the tented arch, the plain arch, and the central pocket loop. The system used by most experts, although complex, is similar to the Henry System of Classification
5.
IBM AIX
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AIX is a series of proprietary Unix operating systems developed and sold by IBM for several of its computer platforms. AIX is based on UNIX System V with 4. 3BSD-compatible extensions and it is one of five commercial operating systems that have versions certified to The Open Groups UNIX03 standard. The AIX family of operating systems debuted in 1986, became the operating system for the RS/6000 series on its launch in 1990. It is currently supported on IBM Power Systems alongside IBM i, Unix started life at AT&Ts Bell Labs research center in the early 1970s, running on DEC minicomputers. By 1976, the system was in use at various academic institutions, including Princeton. This port would later grow out to become UTS, a mainframe Unix offering by IBMs competitor Amdahl Corporation, IBMs own involvement in Unix can be dated to 1979, when it assisted Bell Labs in doing its own Unix port to the 370. In the process, IBM made modifications to the TSS/370 hypervisor to better support Unix and it took until 1985 for IBM to offer its own Unix on the S/370 platform, IX/370, which was developed by Interactive Systems Corporation and intended by IBM to compete with Amdahl UTS. AIX Version 1, introduced in 1986 for the IBM6150 RT workstation, was based on UNIX System V Releases 1 and 2, in developing AIX, IBM and Interactive Systems Corporation also incorporated source code from 4.2 and 4.3 BSD UNIX. Among other variants, IBM later produced AIX Version 3, based on System V Release 3, since 1990, AIX has served as the primary operating system for the RS/6000 series. AIX Version 4, introduced in 1994, added symmetric multiprocessing with the introduction of the first RS/6000 SMP servers and continued to evolve through the 1990s, culminating with AIX4.3.3 in 1999. Version 4.1, in a modified form, was also the standard operating system for the Apple Network Server systems sold by Apple Computer to complement the Macintosh line. IBM maintains that their license was irrevocable, and continued to sell, AIX was a component of the 2003 SCO v. IBM lawsuit, in which the SCO Group filed a lawsuit against IBM, alleging IBM contributed SCOs intellectual property to the Linux codebase. The SCO Group, who argued they were the owners of the copyrights covering the Unix operating system. In March 2010, a jury returned a finding that Novell, not the SCO Group. AIX6 was announced in May 2007, and it ran as an open beta from June 2007 until the availability of AIX6.1 on November 9,2007. Major new features in AIX6.1 included full role-based access control, workload partitions, enhanced security, AIX7.1 was announced in April 2010, and an open beta ran until general availability of AIX7.1 in September 2010. Several new features, including better scalability, enhanced clustering and management capabilities were added, AIX7.1 includes a new built-in clustering capability called Cluster Aware AIX. AIX is able to organize multiple LPARs through the communications channel to neighboring CPUs
6.
Bulletin board system
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A bulletin board system, or BBS, is a computer server running software that allows users to connect to the system using a terminal program. Many BBSes also offer on-line games, in users can compete with each other. Bulletin board systems were in many ways a precursor to the form of the World Wide Web, social networks. Low-cost, high-performance modems drove the use of services and BBSes through the early 1990s. Infoworld estimated there were 60,000 BBSes serving 17 million users in the United States alone in 1994, over the next year, many of the leading BBS software providers went bankrupt and tens of thousands of BBSes disappeared. Today, BBSing survives largely as a hobby in most parts of the world. Most BBSes are now accessible over Telnet and typically offer free email accounts, FTP services, IRC, some offer access through packet switched networks, or packet radio connections. A precursor to the bulletin board system was Community Memory, started in August 1973 in Berkeley. Useful microcomputers did not exist at that time, and modems were both expensive and slow, Community Memory therefore ran on a mainframe computer and was accessed through terminals located in several San Francisco Bay Area neighborhoods. The poor quality of the original modem connecting the terminals to the mainframe prompted a user to invent the Pennywhistle modem, Community Memory allowed the user to type messages into a computer terminal after inserting a coin, and offered a pure bulletin board experience with public messages only. It did offer the ability to tag messages with keywords, which the user could use in searches, the system acted primarily in the form of a buy and sell system with the tags taking the place of the more traditional classifications. But users found ways to express themselves outside these bounds, unfortunately, the system was expensive to operate, and when their host machine became unavailable and a new one could not be found, the system closed in January 1975. Similar functionality was available to most mainframe users, which might be considered a sort of ultra-local BBS when used in this fashion. Commercial systems, expressly intended to offer features to the public, became available in the late 1970s. Early modems were very simple devices using acoustic couplers to handle telephone operation. The user would first pick up the phone, dial a number, disconnecting at the end of a call required the user to pick up the handset and return it to the phone. With the introduction of microcomputers with expansion slots, like the S-100 bus machines and Apple II, it possible for the modem to communicate instructions. A number of modems of this sort were available by the late 1970s
7.
Home computer
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Home computers were a class of microcomputers entering the market in 1977, and becoming common during the 1980s. They were marketed to consumers as affordable and accessible computers that, however, a home computer often had better graphics and sound than contemporaneous business computers. Their most common uses were playing games, but they were also regularly used for word processing, doing homework. Home computers were usually not electronic kits, home computers were already manufactured in stylish metal or plastic enclosures. There were, however, commercial kits like the Sinclair ZX80 which were home and home-built computers since the purchaser could assemble the unit from a kit. For example, using a typical 1980s home computer as a home automation appliance would require the computer to be powered on at all times. Personal finance and database use required tedious data entry, by contrast, advertisements in the specialty computer press often simply listed specifications. Since most systems shipped with the BASIC programming language included on the system ROM, many users found programming to be a fun and rewarding experience, and an excellent introduction to the world of digital technology. Often the only difference may be the outlet through which they are purchased. Another change from the computer era is that the once-common endeavour of writing ones own software programs has almost vanished from home computer use. As early as 1965, some projects such as Jim Sutherlands ECHO IV explored the possible utility of a computer in the home. In 1969, the Honeywell Kitchen Computer was marketed as a gift item, and would have inaugurated the era of home computing. Computers became affordable for the public in the 1970s due to the mass production of the microprocessor starting in 1971. Early microcomputers such as the Altair 8800 had front-mounted switches and diagnostic lights to control and indicate internal system status, while two early home computers could be bought either in kit form or assembled, most home computers were only sold pre-assembled. The keyboard - a feature lacking on the Altair - was usually built into the case as the motherboard. Ports for plug-in peripheral devices such as a display, cassette tape recorders, joysticks. Usually the manufacturer would sell peripheral devices designed to be compatible with their computers as extra cost accessories, peripherals were not often interchangeable between different brands of home computer, or even between successive models of the same brand. To save the cost of a monitor, the home computer would often connect through an RF modulator to the family TV set
8.
Personal computer
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A personal computer is a multi-purpose electronic computer whose size, capabilities, and price make it feasible for individual use. PCs are intended to be operated directly by a end-user, rather than by an expert or technician. In the 2010s, PCs are typically connected to the Internet, allowing access to the World Wide Web, personal computers may be connected to a local area network, either by a cable or a wireless connection. In the 2010s, a PC may be, a multi-component desktop computer, designed for use in a location a laptop computer, designed for easy portability or a tablet computer. In the 2010s, PCs run using a system, such as Microsoft Windows, Linux. The very earliest microcomputers, equipped with a front panel, required hand-loading of a program to load programs from external storage. Before long, automatic booting from permanent read-only memory became universal, in the 2010s, users have access to a wide range of commercial software, free software and free and open-source software, which are provided in ready-to-run or ready-to-compile form. Since the early 1990s, Microsoft operating systems and Intel hardware have dominated much of the computer market, first with MS-DOS. Alternatives to Microsofts Windows operating systems occupy a minority share of the industry and these include Apples OS X and free open-source Unix-like operating systems such as Linux and Berkeley Software Distribution. Advanced Micro Devices provides the alternative to Intels processors. PC is an initialism for personal computer, some PCs, including the OLPC XOs, are equipped with x86 or x64 processors but not designed to run Microsoft Windows. PC is used in contrast with Mac, an Apple Macintosh computer and this sense of the word is used in the Get a Mac advertisement campaign that ran between 2006 and 2009, as well as its rival, Im a PC campaign, that appeared in 2008. Since Apples transition to Intel processors starting 2005, all Macintosh computers are now PCs, the “brain” may one day come down to our level and help with our income-tax and book-keeping calculations. But this is speculation and there is no sign of it so far, in the history of computing there were many examples of computers designed to be used by one person, as opposed to terminals connected to mainframe computers. Using the narrow definition of operated by one person, the first personal computer was the ENIAC which became operational in 1946 and it did not meet further definitions of affordable or easy to use. An example of an early single-user computer was the LGP-30, created in 1956 by Stan Frankel and used for science and it came with a retail price of $47, 000—equivalent to about $414,000 today. Introduced at the 1965 New York Worlds Fair, the Programma 101 was a programmable calculator described in advertisements as a desktop computer. It was manufactured by the Italian company Olivetti and invented by the Italian engineer Pier Giorgio Perotto, the Soviet MIR series of computers was developed from 1965 to 1969 in a group headed by Victor Glushkov
9.
Linux
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Linux is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on September 17,1991 by Linus Torvalds, the Free Software Foundation uses the name GNU/Linux to describe the operating system, which has led to some controversy. Linux was originally developed for computers based on the Intel x86 architecture. Because of the dominance of Android on smartphones, Linux has the largest installed base of all operating systems. Linux is also the operating system on servers and other big iron systems such as mainframe computers. It is used by around 2. 3% of desktop computers, the Chromebook, which runs on Chrome OS, dominates the US K–12 education market and represents nearly 20% of the sub-$300 notebook sales in the US. Linux also runs on embedded systems – devices whose operating system is built into the firmware and is highly tailored to the system. This includes TiVo and similar DVR devices, network routers, facility automation controls, televisions, many smartphones and tablet computers run Android and other Linux derivatives. The development of Linux is one of the most prominent examples of free, the underlying source code may be used, modified and distributed—commercially or non-commercially—by anyone under the terms of its respective licenses, such as the GNU General Public License. Typically, Linux is packaged in a known as a Linux distribution for both desktop and server use. Distributions intended to run on servers may omit all graphical environments from the standard install, because Linux is freely redistributable, anyone may create a distribution for any intended use. The Unix operating system was conceived and implemented in 1969 at AT&Ts Bell Laboratories in the United States by Ken Thompson, Dennis Ritchie, Douglas McIlroy, first released in 1971, Unix was written entirely in assembly language, as was common practice at the time. Later, in a key pioneering approach in 1973, it was rewritten in the C programming language by Dennis Ritchie, the availability of a high-level language implementation of Unix made its porting to different computer platforms easier. Due to an earlier antitrust case forbidding it from entering the computer business, as a result, Unix grew quickly and became widely adopted by academic institutions and businesses. In 1984, AT&T divested itself of Bell Labs, freed of the legal obligation requiring free licensing, the GNU Project, started in 1983 by Richard Stallman, has the goal of creating a complete Unix-compatible software system composed entirely of free software. Later, in 1985, Stallman started the Free Software Foundation, by the early 1990s, many of the programs required in an operating system were completed, although low-level elements such as device drivers, daemons, and the kernel were stalled and incomplete. Linus Torvalds has stated that if the GNU kernel had been available at the time, although not released until 1992 due to legal complications, development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, predated that of Linux. Torvalds has also stated that if 386BSD had been available at the time, although the complete source code of MINIX was freely available, the licensing terms prevented it from being free software until the licensing changed in April 2000
10.
Logbook
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A logbook is a record of important events in the management, operation, and navigation of a ship. It is essential to navigation, and must be filled in at least daily. The term originally referred to a book for recording readings from the chip log, the readings of the log have been recorded in equal times to give the distance traveled with respect to a given start position. The term logbook has spread to a variety of other endeavors. Now, a virtual or electronic logbook is used for record-keeping for complex machines such as nuclear plants or particle accelerators. In military terms, a logbook is a series of official, each document is marked with the time of an event or action of significance. Most national shipping authorities and admiralties specify that logbooks are kept to provide a record of events, and to help crews navigate should radio, radar or the GPS fail. Examination of the detail in a log is often an important part of the investigative process for official maritime inquiries. Logbook entries are sometimes of importance in legal cases involving maritime commercial disputes. Changes may be made to the rough log but the log is considered permanent. Alterations or corrections in an official logbook must be initialled by the keeper of the logbook. The V5C car registration document in the UK is often referred to as the logbook, in the fishing industry, a logbook is used to record catch data as part of the fisheries regulations. It is then submitted to the authorities of the vessels flag state. For amateur radio the logbook is where the hams register their QSO, there are several programs to help radio operators in the management of their logbook. Pilots of aircraft must maintain a pilot logbook to record their time spent flying, in scuba diving, the logbook documents the experience of a diver by logging a divers dives. The Hornblower series mentions logs to explain plot development, or to make the more realistic. In Star Trek, the Captains log, a form of log, is used to fill in the audience as to the events in progress. This is part of a log system that includes personal logs and other officers official logs
11.
Web browser
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A web browser is a software application for retrieving, presenting and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier that may be a web page, image, hyperlinks present in resources enable users easily to navigate their browsers to related resources. Although browsers are primarily intended to use the World Wide Web, the most popular web browsers are Google Chrome, Microsoft Edge, Safari, Opera and Firefox. The first web browser was invented in 1990 by Sir Tim Berners-Lee, Berners-Lee is the director of the World Wide Web Consortium, which oversees the Webs continued development, and is also the founder of the World Wide Web Foundation. His browser was called WorldWideWeb and later renamed Nexus, the first commonly available web browser with a graphical user interface was Erwise. The development of Erwise was initiated by Robert Cailliau, andreesens browser sparked the internet boom of the 1990s. The introduction of Mosaic in 1993 – one of the first graphical web browsers – led to an explosion in web use, Microsoft responded with its Internet Explorer in 1995, also heavily influenced by Mosaic, initiating the industrys first browser war. Bundled with Windows, Internet Explorer gained dominance in the web browser market, Internet Explorer usage share peaked at over 95% by 2002. Opera debuted in 1996, it has never achieved widespread use and it is also available on several other embedded systems, including Nintendos Wii video game console. In 1998, Netscape launched what was to become the Mozilla Foundation in an attempt to produce a competitive browser using the open source software model, as of August 2011, Firefox has a 28% usage share. Apples Safari had its first beta release in January 2003, as of April 2011, the most recent major entrant to the browser market is Chrome, first released in September 2008. Chromes take-up has increased year by year, by doubling its usage share from 8% to 16% by August 2011. This increase seems largely to be at the expense of Internet Explorer, in December 2011, Chrome overtook Internet Explorer 8 as the most widely used web browser but still had lower usage than all versions of Internet Explorer combined. Chromes user-base continued to grow and in May 2012, Chromes usage passed the usage of all versions of Internet Explorer combined, by April 2014, Chromes usage had hit 45%. Internet Explorer was deprecated in Windows 10, with Microsoft Edge replacing it as the web browser. The ways that web browser makers fund their development costs has changed over time, the first web browser, WorldWideWeb, was a research project. In addition to being freeware, Netscape Navigator and Opera were also sold commercially, Internet Explorer, on the other hand, was bundled free with the Windows operating system, and therefore it was funded partly by the sales of Windows to computer manufacturers and direct to users. Internet Explorer also used to be available for the Mac, in this respect, IE may have contributed to Windows and Microsoft applications sales in another way, through lock-in to Microsofts browser
12.
Windows 8
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Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems. Development of Windows 8 started before the release of its predecessor, Windows 7 and it was announced at CES2011, and followed by the release of three pre-release versions from September 2011 to May 2012. The operating system was released to manufacturing on August 1,2012, Windows 8 added support for USB3.0, Advanced Format hard drives, near field communications, and cloud computing. Windows 8 was released to a critical reception. Despite these shortcomings,60 million Windows 8 licenses were sold through January 2013, on October 17,2013, Microsoft released Windows 8.1. It addressed some aspects of Windows 8 that were criticized by reviewers and early adopters, Windows 8 was ultimately succeeded by Windows 10 in July 2015. Support for Windows 8 RTM ended on January 12,2016, per Microsoft lifecycle policies regarding service packs, Windows 8.1 must be installed to maintain support, Windows 8 development started before Windows 7 had shipped in 2009. Three milestone releases of Windows 8 leaked to the general public, milestone 1, Build 7850, was leaked on April 12,2011. It was the first build where the text of a window was written centered instead of aligned to the left and it was also probably the first appearance of the Metro-style font, and its wallpaper had the text shhh. Lets not leak our hard work, however, its detailed build number reveals that the build was created on September 22,2010. The leaked copy was Enterprise edition, the OS still reads as Windows 7. Milestone 2, Build 7955, was leaked on April 25,2011, the traditional Blue Screen of Death was replaced by a new black screen, although this was later scrapped. This build introduced a new ribbon in Windows Explorer, Build 7959, with minor changes but the first 64-bit version, was leaked on May 1,2011. The Windows 7 logo was replaced with text displaying Microsoft Confidential. On June 17,2011, build 7989 64-bit edition was leaked and it introduced a new boot screen featuring the same fish as the default Windows 7 Beta wallpaper, which was later scrapped, and the circling dots as featured in the final. It also had the text Welcome below them, although this was also scrapped, on June 1,2011, Microsoft unveiled Windows 8s new user interface, as well as additional features at both Computex Taipei and the D9, All Things Digital conference in California. The Building Windows 8 blog launched on August 15,2011, featuring details surrounding Windows 8s features, Microsoft unveiled more Windows 8 features and improvements on the first day of the Build conference on September 13,2011. Microsoft released the first public build of Windows 8, Windows Developer Preview at the event
