If the main window is in background, when clicking it the click shouldn't be redirected to program UI
Compare this to Mac behaviour. Clicking on background window do not sends this click to the window.
In Justinmind it does. It causes me to accidentaly click some buttons, for example top tabs (Comments/Site Map) etc.
The first click on background window should only take this window to focus, not send it.
In other words: if the window is in background, I shouldn't be able to interact with it.