Random Number (0-1) Function from Numeric palette is widely used, but it misses such important feature as Seed to initialize a pseudorandom number generator.
Seed is present in TestStand's Random() function for instance and described there as: "An optional number the function uses to determine where in the virtual sequence of random numbers the function obtains its random numbers. When you seed the Random function with the same value, subsequent calls to Random return the same sequence of numbers. If you pass a seed value of 0.0, the function generates a seed value based on the current time. If you do not pass a seed value, the function returns the next number in the current sequence of random numbers."