If the call is synchronous, then VFP will suspend execution until the called method returns. The author of the DLL should be able to tell you more about how it works.

As far as I know 'true COM DLLs' are the only kind that VB can create.


>Ok, I suppose what I was looking for was a way to suspend the VFP application while a VB application does a lookup and returns data to the VFP application. Now does this make sense or should I ask the VB programmers to start writing true COM DLLs?
>
>Rgds
>Petras
>
>>>Thanks for the reply. What if the VB DLL is a "lookup" form which returns the key of the table row selected. In this case, I just want to "call" the VB DLL and not create an object and manipulate it. Does this make sense?
>>
>>Creating and manipulating is "calling" the dll. That's how COM works.