>>Hi all, how can I declare an API interface with VFP6? In VFP 7 the DEFINE CLASS statement has the IMPLEMENTS keyword but not VFP6.
>
>I don't know if it's still available, but there was a DLL from Microsoft back in the VFP 6 era that, I'm pretty sure, provided this capability. VFPCOM.DLL comes to mind.

Yes, it's available at http://www.microsoft.com/downloads/details.aspx?FamilyID=1529819c-2ce8-4e89-895e-15209fcf4b2a but I'm not sure if the latest version willl work in VFP6.