>>Unless you seed the rand() function by using a negative number, like rand(-1), you will ALWAYS get the same series of values.
>
>
>If I do:
>
>

>?rand(1)
>?rand()
>?rand()
>?rand()
>

>
>I will always get the same values.
>
>But when I do:
>
>

>?rand(0)
>?rand()
>?rand()
>?rand()
>

>
>I always get different values.
>
>So what's the difference between rand(-1) and rand(0)?

If you reboot your computer, you will get the same values, AFAIK. Anyway, help suggests to use a negative value.