Hey,
1) Yes, it's supported for that refresh rate for desktop applications.
2) It's supported for gaming as well but actually gaming at 144Hz would not be a good experience so you'd have to tweak the games to run at a lower frame rate (VSYNC OFF, or run Half Adaptive VSYNC and optimize for 72FPS).
*I just wanted to be sure you didn't mean GAMING as in can it run all games at 144FPS as again that's just not going to happen.