How to generate “random” but also “unique” numbers?

Question

How are random numbers generated.? How do languages such as java etc generate random numbers, especially how it is done for GUIDs.? i found that algorithms like Pseudorandomnumb

Answer 1

There are a lot of ways you could generate random numbers. It's usually done with a system/library call which uses a pseudo-number generator with a seed as you've already described.

But, there are other ways of getting random numbers which involve specialized hardware to get TRUE random numbers. I know of some poker sites that use this kind of hardware. It's very interesting to read how they do it.