As a matter of fact, the RNGs used in slots are programmed in a such a way so as to generate up to four billion numbers for every single spin. The programme produces long sequences of random numbers several thousand times per second by using a predetermined formula. Typically, the RNG produces and selects numbers within the range of zero to several billions. The RNG is a microprocessor, similar to those desktop computers run on, whose main purpose is to select numbers within a particular range. The Random Number Generators or RNGs are used to determine the outcome of all online casino games, not just slots. How Random Number Generators (RNG) Work in Online Slots