A few questions...

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Using simple combination of VB front-end and VFP back-end is a very bad choice.
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How much VB work do you do????

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It may easily result in extremely slow data processing. The base reason is that only VFP itself can use Rushmore, and without Rushmore and/or native access, it will be slow.
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Another reason why you really do not understand the product. The query optimizer is in the ODBC driver.

Yet another technically incorrect response from the amazing Mr. Ed....