In Delphi code, Random returns a random number within the range 0 <= X < Range. If Range is not specified, the result is a real-type random number within the range 0 <= X < 1. To initialize the random number generator, add a single call Randomize or assign a value to the RandSeed variable before making any calls to Random. Note: Because the implementation of the Random function may change between compiler versions, we do not recommend using Random for encryption or other purposes that require reproducible sequences of pseudo-random numbers. -- I would argue that: - using Random for encryption always was a bad idea - you have largely incompatible implementations and expectations when you want to make code fpc+delphi7 compilable As for other Random functions, Delphi7 also has Math.RandG (gaussian distribution around a mean) and Math.RandomRange. I would suggest the Math.RandomMT and a simpler, faster random method + good documenting. The above Delphi-help snippet also discourages explicitly the use for encryption and other purposes. A "See also" could be used to get some statistically better distributed random numbers. OR, what was suggested with the "pluggable" Random number generatorcall like the memorymanagers. like I said, just my 2cts... kind regards, Dimitri Smits