The Windows shell is the main graphical user interface in Microsoft Windows, and since Windows 95 hosted by Windows Explorer. The Windows shell includes well-known Windows components such as the Taskbar and the Start menu. The Windows shell is not the same as a "command-line shell" , but the two concepts are related.
The Windows Shell is not to be confused with Windows' window manager (the Desktop Window Manager in Windows Vista and forward or the USER subsystem in previous versions), which displays windows and controls how they look.
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The Windows shell desktop is an array of icons, rendered behind all open windows and taking up the space left by the taskbar. The typical icons displayed on the desktop is as follows:
Right-clicking on a blank area of the desktop displays a menu which contains, apart from the usual file management and organisation options, links to the Personalisation and Screen Resolution control panels (Display Properties in earlier versions), and gadget configuration.
The taskbar is divided into three main areas:
The Start menu consists of a dual-paned menu containing links to various programs and areas of the system.
The left pane of the start menu generally contains software-related shortcuts, including:
The right pane contains links to folders and settings, including:
Autoplay is a feature introduced in Windows XP that examines newly-inserted removeable media for content and displays a dialog containing options related to that media.
The first public demonstration of Windows, in 1983, had a simplistic shell called the Session Control Layer, which served as a constantly visible menu at the bottom of the screen. Clicking on Run would display a list of programs that one could launch, and clicking on Session Control would display a list of programs already running so one could switch between them.[1]
When Windows 1.0 shipped in November 1985, it used the MS-DOS Executive as its shell. MS-DOS Executive was a simple file manager that differentiated between files and folders by bold type, since it lacked support for icons. Programs could be launched by double-clicking on them.
Windows 2.0 also shipped with MS-DOS Executive as the shell. This version bore little change from its predecessor.
Windows 3.0, introduced in May 1990, shipped with a new shell, called Program Manager. Based on Microsoft's work with OS/2 1.0's Desktop Manager, Program Manager sorted program shortcuts into groups (although unlike Desktop Manager, these were housed in a single window, in order to show off Microsoft's new Multiple Document Interface.
Program Manager in Windows 3.1 introduced the new Startup group, which Program Manager would check on launch and start any programs it found in it, and wrappable icon titles.[2] Program Manager was also ported to Windows NT 3.1, and retained in Windows NT 3.51.
Windows 95 introduced a new shell, hosted in Windows Explorer, the file manager for the operating system. The desktop was now a container for files, folders and system areas such as My Computer, Network Neighborhood, and the Recycle Bin, as well as shortcuts, which were now implimented as files. The taskbar was introduced, with an area consisting of buttons representing open windows, a digital clock, a "notifications area" for background processes and system notifications, and the Start button, which harboured the Start menu. The Start menu contained links to settings, recently-used files and, like Program Manager before it, shortcuts and program groups. Since it provided both shell and file management functions, Explorer replaced both Program Manager and File Manager.
Program Manager was also included in Windows 95 as an "escape hatch", in case the user disliked the new interface.[3] This was included with all versions of Windows up to and including Windows XP Service Pack 1. In SP2 and SP3, PROGMAN.EXE is just an icon library, and it was completely removed from Windows Vista in 2006.
The new shell was also ported to Windows NT, first as the NewShell update for Windows NT 3.51 and then integrated fully into Windows NT 4.0.
In early 1996, Netscape announced that the next release of its browser, codenamed "Constellation", would completely integrate with Windows and add a new shell, codenamed "HomePort", which would present the same files and shortcuts no matter which machine a user logged in to.[4][5][6] Microsoft started working on a similar Internet Explorer release, codenamed "Nashville". Internet Explorer 4.0 was redesigned and resulted in two products: the standalone IE4 and the Windows Desktop Update, which updated the shell with features such as Active Desktop, Active Channels, Web folders, desktop toolbars such as the Quick Launch bars, ability to minimize windows by clicking their button on the taskbar, HTML-based folder customization, single click launching, image thumbnails, folder infotips, web view in folders, Back and Forward navigation buttons, larger toolbar buttons with text labels, favorites, file attributes in Details view, and an address bar in Windows Explorer, among other features. It also introduced the My Documents shell folder.
Future Windows releases, like Windows 95C (OSR 2.5) and Windows 98, included Internet Explorer 4 and the features of the Windows Desktop Update already built in, and improvements were made in Windows 2000 and Windows Me, such as personalized menus, ability to drag and sort menu items, sort by name function in menus, cascading Start menu special folders, customizable toolbars for Explorer, auto-complete in Windows Explorer address bar and Run box, displaying comments in file shortcuts as tooltips, advanced file type association features, extensible columns in Details view (IColumnProvider interface), icon overlays, places bar in common dialogs, high-color notification area icons and a search pane in Explorer.
Windows XP introduced a new Start Menu, with shortcuts to shell locations on the right and a list of most frequently used applications on the left. It also grouped taskbar buttons from the same program if the taskbar got too crowded, and hid notification icons if they had not been used for a while. For the first time, Windows XP hid most of the shell folders from the desktop by default, leaving only the recycle bin (although the user could get them back if they desired). Windows XP also introduced numerous other shell enhancements.
In the early days of the Longhorn project, an experimental sidebar, with plugins similar to taskbar plugins and a notifications history was built into the shell. However, when Longhorn was reset this was ditched in favour of a separate program that provided Web-enabled gadgets, replacing Active Desktop.
Windows Vista introduced to the shell a searchable Start menu and live taskbar previews. It also introduced a redesigned Alt-Tab switcher, also with live previews. Windows 7 added 'pinned' shortcuts and 'jump lists' to the taskbar, and automatically grouped program windows into one icon (although this could be reversed.) The Windows 7 shell also re-absorbed the responsibility of rendering gadgets.
Windows Server 2008 introduced the possibility to have a Windows install without the shell, resulting in less services loaded and running.[7][8]
It is possible to replace the default Windows shell with a different program. There exist a number of third party shells designed to be used in place of the standard Windows shell.