One neat little feature of the Lumia 920 Windows 8 phone is the screen shot. On the surface, it is easy as pie. You have to press and hold the Start button and also the Power button at the same time for a quick second or two. But you have to do it just right. It may take a few tries.
When done right, you will a loud camera picture taking sound sound ("c-l-i-c-k"!). This is a good sign and means success. The screen shot goes into your Photo Albums.
It may be useful for troubleshooting or app comparisons or to show off your colorful Windows screen to your iPhone friends, who are still stuck with the drab Apple backgrounds and app logos.