Since Version 1.6.0 of the [[http://news.ampr.at/?p=476|HAMMessenger]], a messenger Client for the HAMNET (Highspeed Amateurradio Multimedia NETwork), it is possible to send a message to (selected) users of the DAPNET:

{{ :usecase:hammessenger.jpg?400 |}}

The HAMMessenger is available at http://news.ampr.at/?page_id=462