I bought DF because of this feature , although it's kind of buggy, for example , im running my game full screen and on second monitor I wanted to surf the web, well I choose a shortcut ALT+A, I can hear the sound it makes when it activates , but I still need to use ALT-TAB to get my mouse over to the other screen , that means I must have any sort of window open in the background to be able to use alt-tab because the game doesn't minimize it's locked there. if no previous window was open I need to click ctrl alt delete .. ( game is Darkfall Unholy Wars ) but BF4 and others does the same..
also once im on the other screen and use the web or other window , most of the times when I minimize a window it brings me back to my game, then I need to alt_atb again but it opens the last window I minimized , so most of the time im stuck with 20+ windows on second screen because if I minimize them it brings me back to the game(my cursor)
other big issue is when im starting to use my second monitor , ( this will be hard to explain ) but my widows will go in like Ghost mode ,kind of like when you minimize a page and it minimize but still on your screen and you cant move or touch it , but it's also kinda faded out is why I call it ghost mode.. very weird and annoying because then I need to get back in my game, disable window deactivation , minimize my game then everything is back to normal .. I was able to produce it wile typing this, I will attach a picture and you can see the folder was actually X'ed out but it stayed there as ghost.
my last issue is , I use Strobelight , not sure if your familiar with that program , it's Strobelight Beta 3 by ToastX , that tool is for gaming monitors 120hz +. it's a epic zero motion blur tool ,
http://www.blurbusters.com/zero-motion-blur/lightboost/
well as soon I enable Window deactivation it disables my Strobelight , very weird no idea why but I've wrote to blur busters to see if it was a problem with lightboost or DF here
http://forums.blurbusters.com/viewtopic.php?f=4&t=71&p=380#p380
thanks.