>>>Thanks Craig, so, we can not use them from VFP?
>>
>>Yes, you can. But to get multi-threading, you have to run them under MTS.
>
>That it what I meant.
>It is MTS only? What about calling them from VB or VC?

VFP DLLs are COM so you can call them from any language or application that supports COM servers. This includes VB, VC++, Delphi, Excel, Word, and a number of others.