Some useful window 8.1 shortcuts key

Keyboard shortcut	Function
+ start typing	Search your PC
Ctrl plus (“+”) or Ctrl minus (“-”)	Zoom in or out of a large number of items
Ctrl + Scroll wheel	Zoom in or out of a large number of items
+ C	Open the charms menu
+ F	Open the Search charm to search files
+ H	Open the Share charm
+ I	Open the Settings charm
+ J	Switch the main app and snapped app
+ K	Open the Devices charm
+ O	Lock the screen orientation
+ Q	Open the Search charm to search apps
+ W	Open the Search charm to search settings
+ Z	Show the commands available in the app
+ spacebar	Switch input language and keyboard layout
+ Ctrl + spacebar	Change to previously selected input
+ Tab	Cycle through open apps
+ Ctrl + Tab	Cycle through open apps and snap them as they are cycled
+ Shift + Tab	Cycle through open apps in reverse order
+ Pg Up	Move the Start screen and apps to the monitor on the left
+ Pg Dn	Move the Start screen and apps to the monitor on the right
+ Shift + Period (“.”)	Snaps apps to the left
+ Period (“.”)	Snaps apps to the right
+ X + Down arrow	Open the Mobility Center
Ctrl + Shift + Esc	Open the Task Manager
Esc	Stop or exit the current task