Microsoft Docs is the library of technical documentation for end users, developers, and IT professionals who work with Microsoft products. Microsoft Docs website provides technical specifications, conceptual articles, tutorials, guides, API references, code samples and other information related to Microsoft software and web services. Microsoft Docs was introduced in 2016 as a replacement of MSDN and TechNet libraries which previously hosted some of these materials. 
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The content on Microsoft Docs is organised into groups based on product or technology and steps of working with it: evaluating, getting started, planning, deploying, managing, and troubleshooting. Navigation panel and product/service pages show material breakdown according to these principle. Each article displays its estimated reading time. There's a function to download specific docs section as a PDF file for offline use.
Website has responsive layout so it is designed to work on mobile devices and tablets.
Most documentation content is open-sourced and accepts pull requests. Each article is represented as markdown file in GitHub repository. Microsoft released a set of Visual Studio Code extensions, Docs Authoring Pack, to assist in editing Microsoft Docs content. It includes the support of Docs-specific markdown features.  
Microsoft Docs preview was introduced in June 2016, initially containing .NET documentation.. The process of migrating the bulk of MSDN and TechNet libraries' content have taken approximately two years. Key events:
The number 9,223,372,036,854,775,807 is the integer equal to 263 − 1. Its prime factorization is 72 · 73 · 127 · 337 · 92737 · 649657, which is equal to Φ1(2) · Φ3(2) · Φ7(2) · Φ9(2) · Φ21(2) · Φ63(2).Bootcfg
In computing, bootcfg is a command on Microsoft Windows NT-based operating systems which acts as a wrapper for editing the boot.ini file.C Sharp (programming language)
C# (pronounced C sharp) is a general-purpose, multi-paradigm programming language encompassing strong typing, lexically scoped, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines. It was developed around 2000 by Microsoft within its .NET initiative and later approved as a standard by Ecma (ECMA-334) and ISO (ISO/IEC 23270:2018). C# is one of the programming languages designed for the Common Language Infrastructure.
C# was designed by Anders Hejlsberg, and its development team is currently led by Mads Torgersen. The most recent version is C# 7.3, which was released in 2018 alongside Visual Studio 2017 version 15.7.2.Cacls
In computing, cacls and its replacement, icacls, are Microsoft Windows native command line utilities capable of displaying and modifying the security descriptors on folders and files. An access control list is a list of permissions for securable object, such as a file or folder, that controls who can access it.Del (command)
In computing, del (or erase) is a command in command-line interpreters (shells) such as COMMAND.COM, cmd.exe, 4DOS, NDOS, 4OS2, 4NT and Windows PowerShell. It is used to delete one or more files or directories from a file system.Echo (command)
In computing, echo is a command that outputs the strings it is being passed as arguments. It is a command available in various operating system shells and typically used in shell scripts and batch files to output status text to the screen or a computer file, or as a source part of a pipeline.JScript
JScript is Microsoft's dialect of the ECMAScript standard that is used in Microsoft's Internet Explorer.
JScript is implemented as an Active Scripting engine. This means that it can be "plugged in" to OLE Automation applications that support Active Scripting, such as Internet Explorer, Active Server Pages, and Windows Script Host. It also means such applications can use multiple Active Scripting languages, e.g., JScript, VBScript or PerlScript.
JScript was first supported in the Internet Explorer 3.0 browser released in August 1996. Its most recent version is JScript 9.0, included in Internet Explorer 9.
JScript 10.0 is a separate dialect, also known as JScript .NET, which adds several new features from the abandoned fourth edition of the ECMAScript standard. It must be compiled for .NET Framework version 2 or version 4, but static type annotations are optional.Microsoft Developer Network
Microsoft Developer Network (MSDN) is the portion of Microsoft responsible for managing the firm's relationship with developers and testers, such as hardware developers interested in the operating system (OS), and software developers developing on the various OS platforms or using the API or scripting languages of Microsoft's applications. The relationship management is situated in assorted media: web sites, newsletters, developer conferences, trade media, blogs and DVD distribution. The life cycle of the relationships ranges from legacy support through evangelizing potential offerings.Microsoft Office 2019
Microsoft Office 2019 is the current version of Microsoft Office, a productivity suite, succeeding Office 2016. It was released to general availability for Windows 10 and for macOS on September 24, 2018. Some features that had previously been restricted to Office 365 subscribers are available in this release.Microsoft TechNet
Microsoft TechNet is a Microsoft web portal and web service for IT professionals. It includes a library containing documentation and technical resources for Microsoft products, a learning center which provides online training, discussion forums, an evaluation center for downloading trialware, blogs for Microsoft employees and a wiki.
TechNet originally provided a software subscription service similar to Office 365 and Adobe Creative Cloud that allowed subscribers to download Microsoft software under a software as service license for private use. On July 1, 2013, it was announced that Microsoft is discontinuing the TechNet subscription service, with the purchase and renewal of subscriptions to be closed by August 31, 2013.TechNet also included a web-based TechNet Magazine which is discontinued since October 2013. Past issues are still available for reading.Recover (command)
In computing, recover was a primitive filesystem error recovery utility included in MS-DOS / IBM PC DOS versions prior to DOS 6.0.Replace (command)
In computing, replace is a command that is used to replace one or more existing computer files or add new files to a target directory.SQL Server Express
Microsoft SQL Server Express is a version of Microsoft's SQL Server relational database management system that is free to download, distribute and use. It comprises a database specifically targeted for embedded and smaller-scale applications. The product traces its roots to the Microsoft Database Engine (MSDE) product, which was shipped with SQL Server 2000. The "Express" branding has been used since the release of SQL Server 2005.Sysinternals
Windows Sysinternals is a website which offers technical resources and utilities to manage, diagnose, troubleshoot, and monitor a Microsoft Windows environment. Originally, the Sysinternals website (formerly known as ntinternals) was created in 1996 and was operated by the company Winternals Software LP, which was located in Austin, Texas. It was started by software developers Bryce Cogswell and Mark Russinovich. Microsoft acquired Winternals and its assets on July 18, 2006.The website featured several freeware tools to administer and monitor computers running Microsoft Windows. The software can now be found at Microsoft. The company also sold data recovery utilities and professional editions of their freeware tools.Systeminfo.exe
In computing, systeminfo, is a command-line utility shipped with Microsoft Windows versions from Windows XP onwards.TYPE (DOS command)
In computing, type is a command in various command-line interpreters (shells) such as COMMAND.COM, cmd.exe, 4DOS/4NT and Windows PowerShell used to display the contents of specified files on the computer terminal. The analogous Unix command is cat.Windows Hardware Error Architecture
Windows Hardware Error Architecture (WHEA) is an operating system hardware error handling mechanism introduced with Windows Vista and Windows Server 2008 as a successor to Machine Check Architecture (MCA) on previous versions of Windows. The architecture consists of several software components that interact with the hardware and firmware of a given platform to handle and notify regarding hardware error conditions. Collectively, these components provide: a generic means of discovering errors, a common error report format for those errors, a way of preserving error records, and an error event model based up on Event Tracing for Windows (ETW).WHEA "builds on the PCI Express Advanced Reporting to provide more detailed information about system errors and a common reporting structure."WHEA allows third-party software to interact with the operating system and react to certain hardware events. For example, when a new CPU is added to a running system—a Windows Server feature known as Dynamic Hardware Partitioning—the hardware error component stack is notified when a new processor is installed. There are few Unknown Hardware Errors in Windows 10 which are solved by reverse engineering, running SCF scan.Windows Server 2019
Windows Server 2019 is the latest version of the server operating system by Microsoft, as part of the Windows NT family of operating systems.WordBASIC
WordBASIC was a subset of Microsoft QuickBASIC customized for word-processing. It was replaced by Visual Basic for Applications (VBA) when Word 97 was released. Contrarily to VBA, WordBasic was not object-oriented but consisted of a flat list of approximately 900 commands.