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==Shell and user interface==
[[File:Windows 8 pre-login.png|thumb|The revised lock screen interface in Windows 8]]
Windows 8 features a redesigned user interface built upon the [[Metro (design language)|Metro design language]],<ref name="Pietroforte">{{cite web |url=http://4sysops.com/archives/windows-8-new-features-the-complete-list-updated/ |title=Windows 8 new features – The complete list (updated) |last=Pietroforte |first=Michael |work=4sysops |date=August 28, 2012
[[Metro-style apps]] can either run in a full-screen environment, or be snapped to the side of a screen alongside another app or the desktop; snapping requires a screen resolution of 1366×768 or higher.<ref name=zdnet-smallertab>{{cite news|title=New Windows 8 hardware specs hint at 7-inch tablets and a Microsoft Reader|url=https://www.zdnet.com/article/new-windows-8-hardware-specs-hint-at-7-inch-tablets-and-a-microsoft-reader/|work=ZDNet|access-date=March 29, 2013|archive-date=December 4, 2014|archive-url=https://web.archive.org/web/20141204160922/http://www.zdnet.com/new-windows-8-hardware-specs-hint-at-7-inch-tablets-and-a-microsoft-reader-7000013271/|url-status=live}}</ref> Windows 8.1 lowers the snapping requirement to a screen resolution of 1024x768.<ref name="Callaham">{{cite web |url=http://www.neowin.net/news/windows-blue-lowers-modern-app-snap-view-resolution-to-1024x768 |title=Windows 'Blue' lowers Modern app snap view resolution to 1024x768 |last=Callaham |first=John |website=Neowin |date=March 26, 2013 |access-date=February 22, 2013 |archive-date=March 29, 2013 |archive-url=https://web.archive.org/web/20130329123304/http://www.neowin.net/news/windows-blue-lowers-modern-app-snap-view-resolution-to-1024x768 |url-status=live }}</ref> Users can switch between apps and the desktop by clicking on the top left corner or by swiping the left side of the touchscreen to invoke a sidebar that displays all currently opened Metro-style apps. Right-clicking on the upper left corner provides a [[context menu]] with options to switch between open apps. The traditional desktop is accessible from a tile on the Start screen or by launching a desktop app. The {{key press|Alt|Tab}} shortcut cycles through all programs, regardless of type.
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===Hardware support===
Windows 8 adds native support for [[USB 3.0]], which allows for faster data transfers and improved power management with compatible devices.<ref>{{cite web |first=Dennis |last=Flanagan |editor-first=Steven |editor-last=Sinofsky |editor-link=Steven Sinofsky |url=http://blogs.msdn.com/b/b8/archive/2011/08/22/building-robust-usb-3-0-support.aspx |title=Building robust USB 3.0 support |website=Building Windows 8 |publisher=Microsoft |date=August 2011 |access-date=February 17, 2012 |archive-date=February 24, 2012 |archive-url=https://web.archive.org/web/20120224014118/http://blogs.msdn.com/b/b8/archive/2011/08/22/building-robust-usb-3-0-support.aspx |url-status=live }}</ref><ref>{{cite web |url=http://www.zdnet.com/blog/microsoft/microsoft-to-provide-usb-30-support-for-better-battery-life-in-windows-8/10396 |title=Microsoft to provide USB 3.0 support for better battery life in Windows 8 |website=[[ZDNet]] |publisher=[[CBS Interactive]] |date=August 2011 |access-date=August 30, 2011 |archive-url=https://web.archive.org/web/20110926134525/http://www.zdnet.com/blog/microsoft/microsoft-to-provide-usb-30-support-for-better-battery-life-in-windows-8/10396 |archive-date=September 26, 2011 |url-status=dead }}</ref> This native stack includes support for the newer, more efficient [[USB Attached SCSI]] (UAS) protocol,<ref>{{cite web |first=Jerome |last=Myers |url=http://plugable.com/2012/10/25/usb-3-0-support-on-windows-8 |title=New USB 3.0 Support Built-In to Windows 8 |website=Plugable |date=October 25, 2012 |access-date=January 20, 2014 |archive-date=February 1, 2014 |archive-url=https://web.archive.org/web/20140201154348/http://plugable.com/2012/10/25/usb-3-0-support-on-windows-8 |url-status=live }}</ref><ref>{{cite web |url=http://msdn.microsoft.com/en-us/library/windows/hardware/dn423379%28v=vs.85%29.aspx#loadeddriver |title=USB in Windows - FAQ (Windows Drivers) |website=[[MSDN]] |publisher=[[Microsoft]] |date=November 16, 2013 |access-date=January 20, 2014 |archive-date=January 5, 2014 |archive-url=https://web.archive.org/web/20140105230801/http://msdn.microsoft.com/en-us/library/windows/hardware/dn423379(v=vs.85).aspx#loadeddriver |url-status=live }}</ref> which is turned on by default even for USB 2.0 devices,<ref>{{Cite web |url=http://msdn.microsoft.com/en-us/library/windows/hardware/jj248714.aspx |title=USB Attached SCSI (UAS) Best Practices for Windows 8 |website=[[MSDN]] |publisher=[[Microsoft]] |format=[[Office Open XML]] |page=6 |date=July 24, 2012 |access-date=January 20, 2014 |archive-date=February 6, 2013 |archive-url=https://web.archive.org/web/20130206235329/http://msdn.microsoft.com/en-us/library/windows/hardware/jj248714.aspx |url-status=live }}</ref> although these must however have supporting firmware/hardware to take advantage of it. Windows 8.1 enhanced support for power saving features of USB storage devices, but this addition was not without problems, with some poorly implemented hardware degrading user experience by hangs and disconnects.<ref>{{cite web |first=Jim |last=Bovee |url=http://blogs.msdn.com/b/usbcoreblog/archive/2013/11/01/help-after-installing-windows-8-1-my-usb-drive-disappears-or-file-transfers-stop-unexpectedly-r-a-post-title.aspx |title=Help! After installing Windows 8.1, my USB drive disappears or file transfers stop unexpectedly… |website=Microsoft Windows USB Core Team Blog |publisher=[[Microsoft]] |date=October 31, 2013 |access-date=January 20, 2014 |archive-date=January 22, 2014 |archive-url=https://web.archive.org/web/20140122103020/http://blogs.msdn.com/b/usbcoreblog/archive/2013/11/01/help-after-installing-windows-8-1-my-usb-drive-disappears-or-file-transfers-stop-unexpectedly-r-a-post-title.aspx |url-status=live }}</ref> Windows 8 adds support for [[Human interface device|HID]] over [[I²C|I2C]].<ref>[https://docs.microsoft.com/en-us/windows-hardware/drivers/hid/hid-over-i2c-guide Introduction to HID over I2C]</ref>
Support for [[Advanced Format]] hard drives without emulation is included for the first time.<ref>{{cite web |title=Advanced format (4K) disk compatibility update (Windows) |url=http://msdn.microsoft.com/en-us/library/windows/desktop/hh848035(v=vs.85).aspx |website=[[MSDN]] |publisher=Microsoft |date=November 28, 2012 |access-date=January 3, 2013 |archive-date=January 11, 2013 |archive-url=https://web.archive.org/web/20130111233631/http://msdn.microsoft.com/en-us/library/windows/desktop/hh848035(v=vs.85).aspx |url-status=live }}</ref>
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Windows 8.1 improves hardware support with [[DirectX]] 11.2.<ref>{{cite web |url=http://msdn.microsoft.com/library/windows/apps/bg182410 |title=Windows 8.1 Preview: New APIs and features for developers |work=[[MSDN#Library|MSDN Library]] |publisher=[[Microsoft]] |date=June 26, 2013 |access-date=June 27, 2013 |archive-url=https://web.archive.org/web/20130628080725/http://msdn.microsoft.com/library/windows/apps/bg182410 |archive-date=June 28, 2013 |url-status=dead }}</ref>
Windows 8.1 adds native support for [[NVM Express]]. Windows 8.1 adds support for Precise Touchpad, which allows operating system to management gestures of USB and I2C [[touchpad]]s.<ref>{{cite web | title=Windows precision touchpad devices - Compatibility Cookbook | url=https://learn.microsoft.com/en-us/windows/compatibility/precision-touchpad-devices }}</ref>
Windows 8 adds support for UEFI Secure Boot, and [[Trusted Platform Module|TPM]] 2.0. UEFI with secure boot enabled is a requirement on computers shipped with Windows 8.<ref>{{cite web | url=https://www.networkworld.com/article/738394/microsoft-subnet-next-gen-boot-spec-could-forever-lock-linux-off-windows-8-pcs.html | title=Next-gen boot spec could forever lock Linux off Windows 8 PCS }}</ref><ref>{{cite web | url=https://arstechnica.com/information-technology/2011/09/windows-8-secure-boot-will-complicate-linux-installs/ | title=Windows 8 secure boot could complicate Linux installs | date=September 21, 2011 }}</ref>
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