>
>I was thinking in terms of VFP pier-to-pier (apartment threaded?) COM. If two clients instanciate the same server, could the server be used to pass (push) a message from one of the clients to the other? I've had some experience with
>languages that offer an HWND port.

No. It won't be apartment model threaded. You have to run the DLL under MTS or COM+ to get that.

And, it doesn't work the way you want. The DLL runs in the process space of the EXE that is hosting it.

>
>I guess I am trying to understand if a server can be "aware" of the clients
>holding it's object reference, and can the server direct mesaages (providing a push mechanism is in place) to a specific client.

I don't think you can do that. What exactly are you trying to accomplish? Maybe there is another way to make it work.