InPrivate Browsing feature can help you browser website without storing data such as cookies, history and temporary Internet files, and also disabling Toolbars and extensions. It is useful to create browsing session securely on your Surface RT or Windows 8 Pro.
How to Turn on InPrivate Browsing in Internet Explorer 10 Metro app in Windows 8 or RT
* Tap or Click on the IE tile from start screen.
* Within Internet Explorer 10 Metro app, try one of these tips:
Swipe down toward the center of the touch screen, tap the 3 dots (… icon) on the right side of the bar, and then select “New InPrivate tab”
Press the Ctrl + Shift + P keys from keyboard.
Press the Windows + Z keys, right-click any empty area. Click on the Tab tools button and then New InPrivate tab
Now a new tab will open. Its address bar at bottom comes with an InPrivate box, which indicates that the feature is turned on.