>I sort of have this working now. Two problems...
>
>1. When I change the senders RTS line, the receiver (VB activex DLL) oncomm fires three times.

Sorry, don't have a clue on this one. Maybe somebody else can jump in.

>2. When the com activities are done I need to return about 2K in text. Can I send that back from the dll?

Sure enough. A variable-length string variable in VB can accept up to 2 billions characters and VFP can accept up to 16,777,184 characters in a variable.