>>How safe is it to use sys(2015) to generate unique ids for table records. Is >there a high probability of duplication of ids?
>>
>>David
>
>Not if its a single user application.
>Add more users, and you'll increase your odds.

I was using a combination of user_id+subs(sys(2015),3) for some sort of replication scheme, so I had unique ids and origin in the same field. Still, I kept the user_id very short (two chars), which I could do because there were only four of them.