>We use sys(15) to generate unique filenames as well and we stumbled on something weird. If you write a program that print unique filenames for a couple of seconds you will see that duplicates will occur. We solved it by creating our own sys(15) function that has a .05 seconds delay. With this modification no duplicates have been created.
>
>Ron

Are you sure that it is SYS(15) function you're using? :)