Windows 8.1 user interface improves on previous Windows 8 features
Windows 8 was distinguished from other tablet OSes such as iOS because it enabled multitasking by running two apps on screen at once. Microsoft referred to this capability as Snap. The problem with Snap however, was that it supported only two simultaneous apps, and you couldn't adjust the window sizes.
Windows 8.1 has dramatically improved Snap by allowing multiple apps to be viewed at once (your display resolution is the limiting factor). You can also adjust the size of each window rather than being limited by the operating system controlling the display size. Here, you can see three apps on the screen at once.
I say: "Taking away capabilities that were available in Win XP, Win 95, etc. and then
only partially giving them back is an improvement only in the mind of seriously narcissistic personalties. Here I sit with Win XP, with 8 windows open, and I wonder
how in the world Win 8.1 can be proud of 'quote unquote' "allowing" three windows to be seen? Just give back ALL the capabilities of Win XP, then get rid of the annoyances, and then may be we'll talk."