>I always get Open Tables screen pop-up if 10+ users running app simultaneously.
>
>it seems VFP cannot handle high volume transactions.
>
>is this VFP problem or .dbf problem?
>
>I'm using VFP 9
>
>please advise

I've never seen or heard of this problem. Are you opening and closing tables all the time? Other things that can make VFP do that are incorrect aliases, an earlier command that failed, which could be happening with more users.