Set your game resolution to the same resolution as your windows desktop.
Then, right after launching the game, press alt+enter. (this does not work when you're in an actual game. I even think it doesn't work in a lobby, but I'm not sure)
This way, it will still take up your entire screen, just like it does when you're running it normally, but you'll be able to alt-tab to whatever other program you want to use while in a lobby or whatever.
It should hover over your windows taskbar, if not, enable the 'auto hide taskbar ' feature.
The only difference in visibility is the title bar on top of the screen.
I don't mind, but if you do, there are programs that disable this as well.
Google: alteriwnet window mode leet, first result.
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