George Stoianov wrote:

Admittedly I am no expert on this but is it possible that the remote host are joining a multicast session in which they belong to the same multicast group and even though your program connects to the router and send singlas using the same socket more then one machine picks up the signal.

Hmm, it didn't cross my mind before. Yes this is one possible situation. Regards, Verdi -- Sparen beginnt mit GMX DSL: http://www.gmx.net/de/go/dsl