is "instant on" when opening the screen/cover.
The same effect can be done on Windows desktops (8, 7)
by sending device to "sleep" mode. In that mode all modules are turned off
expect for memory, that is using very little power (1-2W).
To make this feature easy to use, a convenient icon can be added to start page, menu or desktop.
How to Add Shutdown / Restart / Sleep to the Windows 8 Metro Start Screen - How-To Geek
Essentially, adding shortcuts to start menu.
Windows 7 start menu is included to Windows 8 modern start "tiles"
Shutdown: shutdown.exe -s -t 00
Restart: shutdown.exe -r -t 00
Lock: rundll32.exe user32.dll,LockWorkStation
Hibernate: rundll32.exe powrProf.dll,SetSuspendState
Sleep: rundll32.exe powrprof.dll,SetSuspendState 0,1,0
To make sleep effective (quick to start), need to turn off hibernate.
That is done from command prompt (with admin rights), with command:
> powercfg -hibernate off
Here is a discussion on a forum about this.