The Lock Screen
Windows 8's lock screen is pretty much what you'd expect: it's got a beautiful picture along with a few little widgets full of information, like the time, how many emails you have, and so on. You can swipe up to unlock, or press the spacebar if you're on a desktop keyboard. You can then proceed to type your normal password, or use one of Windows 8's "picture passwords," which let you swipe or draw an invisible gesture that only you know, using your lock screen photo as reference, to let yourself in (though this is really better on tablets than it is on a PC). For example, in Microsoft's original demo, they used a photo of a person, and the password was to tap on their nose and swipe left across their arm).

The Start Screen
The Desktop

It isn't nearly as convenient as the old Start menu was, but you can get used to most stuff pretty quickly. Pressing the Windows button and typing in an app or setting is faster than browsing the Start menu anyway, so it's a good habit to get into, and you can always access a more traditional menu by pressing Win+X—this will bring up a small menu in the corner that has shortcuts to the Control Panel, Run, the Command Prompt, and other stuff advanced users may want to access.
Full Screen Apps

The full-screen apps that come with Windows 8 are really nice: most have touch-based controls, like pinch to zoom and copy and paste, but you can also use them with a mouse and keyboard if you so desire. Each has options like search, share, and settings through the Charms bar, which you can get by swiping from the right edge of the screen or pressing Win+C. Apps can share information one another easily, such as selected text or photos. After picking your media from one app, you'll then be able to choose which app you want to share with, and work with it from there. For example, you can share photos to Facebook, send text from a web page in an email, and so on.
None of this is brand new to touch-based platforms, but what is new is the ability to not only multitask, but run these apps side by side. Say you want to watch a video and keep an eye on your news feed at the same time. Just like in Windows 7 for the desktop, you can dock an app to one side of the screen while docking another app at the opposite side, which is a seriously cool feature. Imagine being able to IM and play a game at the same time, or browse the web while writing an email. It's a fantastic way to fix one of the big shortcomings of mobile OSes, thus allowing you to ignore the full desktop interface more often and stay in the touch-friendly, tablet view.
Windows Explorer
Full size

A New Task Manager

msconfig
.Other Features
Along with these cool features, Windows 8 also comes with other features we've come to know and love to see in desktop and mobile OSes alike. It's got system-wide spellchecking, so you don't have to rely on a specific app to keep your writing top-notch, as well as a system-wide search feature, that lets you search anything from your music library to your contacts to the web itself. It also has a really cool feature for desktop users that lets your run the Metro UI on one monitor while running the traditional desktop on the other (not to mention better support for multiple monitors in general—like having the taskbar on both screens).

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