In tlauncher we have to enter a username and the username can be anything from Notch to NotMrBeast and if we play on a server where they also play when we log on we will be them in game like we will basically be Notch (we log on where they last logged off and we will have their inventory armour etc) and we can also use commands (if the person we are impersonating is an op)and we can open as many tlaunchers as we want and be as many people we want.