>Yes it's application specific; but how can send an DDE message to an application form another machine on network?

Tenea,

If you're using VFP on both ends and messages only need to display inside of the VFP applications, why not just use a message queue table?

Create a table that all machines look at on the network, then add messages
to the queue that identify the recipient and the message. Use a timer object
in your main application class to occasionally poll the queue and look for
messages and if you find one pop up a dialog.

Network DDE and WinPopup are highly unreliable mechanisms. Using a table
based approach is much more stable since it has the persistence of a
table.

Plus I guarantee you it'll be much easier to implement this way <s>...

Regards,