[Closed] How does RNG work?

Depends entirely on the room, some rooms have card shuffling algorithms, so each table will basically have its own deck of cards and regardless of call or fold the flop will come the same, however if the room has real time card shuffling, i.e. the RNG is called once the flop is to be dealt, it should theoretically be different because the cipher would be at a different point. In the past some rooms have released their RNG algorithm to prove fairness. One room in the past released their algorithm and there was a massive exploit which meant that someone could replicate the shuffle and figure opponents hole cards!

And how would I know which room has which kind of algorithms?

You don't know unless they released their card shuffling algorithm. It doesn't matter anyway? Infact imo its better if its not even a shuffling emulation, if it is literally determined by grabbing a random number from one big universal cipher it would be much better since it would make it so hard for anyone to be able to exploit. For example, if they had one big cipher for every hand in the game, or every hand on that particular server then think how hard it would be for someone to exploit? Say someone figured a way to predict everyones whole cards, they could reverse stars' algorithm, if the cipher was rotating 99999 times a second they are never going to be able to piece it together. It's hard for me to talk about because I really don't know exactly how rooms do it, all I know is that how they do it is almost completely irrelevant.