Finally i found a solution !
To use this functionnality with the business role "Service pro", I modified 2 parameters in technical role of "Service pro" :
- Comp. Application : "CRMCMP_IC_FRAME". I replaced the actual by the same parameter of the "IC_AGENT".
- Replace the start page by : "Start.htm".
You will see all of messages you sended in Broadcast Messaging in the the bottom of the page.
If you need more information: bastien.deboisrolin@gmail.com