Microsoft has included a new feature in Windows 8.1 to enable easier multitasking, allowing users to run apps side-by-side on a single screen. So, for instance, clicking on a picture within an email will launch the image in the photo app alongside the Windows 8 mail application. Similarly, tapping a link in an email will open the Web page in Internet Explorer in a separate window alongside the Mail app.
The ability to run multiple apps simultaneously will also improve, with snap views so you can see more than two apps on your screen and resize those apps, rather than having one main and one docked app as in Windows 8. That way, you can literally build your interface to look exactly how you like. Plus, users can have the same app running on multiple windows, such as Internet Explorer, for improved multitasking capabilities.