> Why? > > Advantages? > > I don't comprehend the difference between a borderless full screen window, and simply > running at full screen.
With a borderless full screen windowed mode, the transition from desktop to game in MAME is completely seamless. You know how when you launch a program that runs in full screen exclusive mode, you see your display wig out for a second when it switches modes? That's completely gone when you launch programs that run in a window.
For people who have arcade cabinets and want their game launches to be free of any ugly transitions or artifacts, it's a nice bonus. Also, when you launch MAME in windowed mode, it's actually slightly faster than launching a game in full screen exclusive mode (because you don't have to switch).
Another scenario is playing a game where you want to look up hints on GameFAQS, and you want to transition back and forth from game to web browser, it's WAY faster to alt tab when you're running in windowed mode. This is one of the main reasons people run modern PC games in full screen windowed mode. You can jump between programs way faster.
Finally, if you run MAME in full screen exclusive mode, it will try to pick the refresh rate that most closely matches the game. If I have a 144hz LCD with lightboost or ULMB and want to run the game in a low persistence mode to eliminate motion blur, I can't do it in full screen exclusive mode, because MAME's always going to pick a mode around 60hz because that's the game's native refresh rate. With a borderless full screen window mode, I can actually run MAME in low persistence mode at 120hz, because my desktop's already been set to run at 120hz in low persistence mode, so I can play those games without motion blur without any black frame insertion hacks to MAME.
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