Getting a *more* random value

[Pupeno]

Hello.
I have an application where new processes are launched which calculate one 
random number between 0 and 512 and then do something with that number and 
terminate.
I am currently using random:uniform(513) - 1 but that gives me the same random 
value for all the processes for each run of the application. I see that 
consecutive calls would get other numbers but I only need one.
How am I supposed to get a number that is not the same on every process ?
Thank you.
-- 
Pupeno <pupeno@REDACTED> (http://pupeno.com)
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