Imagine screen 1 is your laptop screen a TV is your second. On the second screen you are watching a video using Windows Media Player in full screen mode.
The #issue: Clicking on screen 1 anywhere at all takes Windows Media Player out of full screen mode back to Window Mode. This is a little frustrating and is clearly an oversite on the part of the programmer of the driver and also Intel.
The workaround is simply to use WMP with the window maximised as opposed to full screen mode.