>I just discovered what you're saying is correct and then read your post. I changed my code to show the ALIAS only. I changed it to the following, after I realized that the function is looking for the ALIAS name and not also the whole path.
>
>

>IF !USED("CERTS")
>   USE E:\PRODUCTION\DATA\CERTS EXCLUSIVE IN 0
>ENDIF
>

This would not guarantee you can open this table exclusively. Somebody else may have it opened as well as it could be opened under different alias or in a different DS. Always put this block of code in try/catch construct.