Run two instance Unity application on 2 screens

AFAI$$anonymous$$, Unity editor does not allow another instance of unity while one is running. I can think of only option is virtual machine, but then again, you wouldn't want to install virtual machine just because you want another instance of unity. Besides, even if you did that, unity pro won't work in this case as the hardware is same (Unity uses HWID for recognition of licenses). This is not a concrete fact, just my opinion.

Ok, thank you for your reply. But for another solution maybe you know how to expand unity application on two monitors? I tried command line argument "-popupwindow" that was describe in this post http://answers.unity3d.com/questions/59058/unity-multi-monitor-dual-screen.html but it runs full screen on one monitor. Also I don't know how I should properly setup resolution to fill both screens.