Would be nice to have the Window ID available for each window created.
At the moment there is no possible way that I know of to know the OS window id of a window.
In OSX you are able to get a window ID through something like osascript -e 'tell app "Safari" to id of window 1', although the command does fail when used with node-webkit.
osascript -e 'tell app "Safari" to id of window 1'
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