Scheduled Mulitcasting

Hi
I'm new to multicasting, but our multicast enviroment works perfekt, but
we've set up 30 machines to boot up every monday morning at 6 AM and now
we would like to have the server to schedule the multicast on the server
at the same time, is that posible og just 5 minuttes before 6 AM.

Regards

Tore Dalsgaard
Forest & Landscape
Denmark
www.sl.kvl.dk