Larry,

>IMHO, there are two types of Keys in a database system:
>
>a. System-level Keys - ONLY the system (programs) will ever see or use these keys.
>b. User-level Keys - The end-users will see these (i.e. Product ID, Customer ID, etc)

Ditto for me. It's just that I use SYS(2015) for the system-level key values. From now on, it's GUID for me!

Thanks for the inputs!

Dennis