Format
rand_seed(Seed)
Args
Seed: An integer used to initialize the random number generator.
Many DM procedures make use of a pseudo-random number generator. You can use rand_seed() to initialize the generator. The sequence returned by the generator is identical each time it is initialized with the same seed, so you could use this to reproduce the same output from an algorithm that uses the random number generator. If you never call rand_seed(), the generator is initialized with a seed from the system clock, so it is effectively random.
Note that with multiple realtime algorithms making calls to the generator at unpredictable times, you are likely not to get the same result even when using the same seed. The overall sequence will be the same, but individual sub-components of your world might call it in a different order.
The pseudo-random number generator is system dependent, so do not expect the sequence generated from a particular seed to be identical on two different machines or operating systems.