You know the feeling when you are in the mood to play some classic games, right? I fell into this mood past weekend and I downloaded Warcraft III. It is still an amazing game although the cinematics feel old now. But I remember that when I bought the game I was impressed by the cinematics.
I wanted to play the game on the external monitor but you have no option in the menus to bring the game into a windowed mode.
After googling around I found out that it is simple to do that: Command key + M. And now just drag the window from your primary display to the external display.
Btw, I really respect DuckDuckGo's privacy effort but I get better search results from Google (although DuckDuckGo is the default search engine on my all devices).