If you want to have some kind of "management" screen, you can set up client message handlers that call system.util.exit, and then use system.util.sendMessage to broadcast a message to those other clients requesting that they close.
If you want to have some kind of "management" screen, you can set up client message handlers that call system.util.exit, and then use system.util.sendMessage to broadcast a message to those other clients requesting that they close.