[RMXP] HOW CAN I MAKE THE GAME GET THE USER'S WINDOWS USERNAME?

You may be squinting at this question but don't worry, it's more of a fourth wall break type thing. I'm a complete noob and can't work out scripts or plugins so try to simplify it, this is my first game. So during the first gameover I will have 2 choices: leave and return to title screen. I want the "Leave" option to result in a custom popup as a message to the player that breaks the fourth wall and refers to them by their actual windows username.
-G3n