c47439d4_of_Windows_8_Keyboard_Shortcut__Description
[Keyboard Shortcut] Win+Left Arrow / Win+Right Arrow [Description] 
Maximizes the current desktop application on the side of the screen indicated by the direction of the arrow you pressed. "Win+Left Arrow" will maximize the current window on the left side. This works much like app snapping in the Modern interface.
Useful List of Windows 8 Keyboard Shortcut
Description