Home made Random Function?

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I'm messing about with a simple procedural routine but would like a specific seed to generate the same random number on everyones machines. I know there are known issues.

Has anyone created their own function which can be used in a similar was to the native version? Even if you couold point me in the direction of convertable code/theory to create one myself?

I'd like to avoid DLL's completely.

Cheers
Stevie