Maybe, maybe not... multiple cores are tied to threads so a thread executing is usually processing on a single core. Since VFP apps are single threaded (at least your user code) it's tied to a specific thread. If you run two instances that second instance may be running on a different processor when it starts up and if it does you essentially have two VFP apps processing simultanously on separate processors. But there's no guarantee that this will actually happen. If both happen to start on the same processor there will be no benefit.

Realistically though there's always a benefit in that hte OS has multiple threads to work with and it can decide what needs resources. Probably the biggest thing about multi-processor and multi-core machines is that it is much much rarer that you hang windows due to a process (liek Explorer) misbehaving).

>Imagine writing an app that shares a table and processes a lot of math calcs.
>Compile it and name it appA
>Compile it again and name it appB
>appA uses the top half of the table
>appB uses the bottom half of the table
>Run them both at the same time
>Will the apps take advantage of the dual core?