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I have used the slib random number generators. They work fine, but are about 50 times slower than my C ones. However, as they are more highly portable, especially on platforms without dynamic loading, I have tried to use identical syntax for the inteface to my loadable c ones. In the particular application the slib generators used over 70% of the CPU alone; replacing them with C was a big win. YMMV. This seems to me a reasonable principle; when something portable exists in slib, which one might like to speed up with a C version keep a compatable interface. Some of slib seems to be a bit, um, `idiosyncratic', so I am sure we do not need to follow the principle slavishly. Julian Satchell <satchell@dera.gov.uk>