RMI server send message to client

Hi. Is it possible for the RMI server to send a message to client ? Most of the time, it's the client that request object from the server but is it possible for the server to independently send a message to the client ?

I would like to add a function in my program which uses RMI, where the server admin could send a message or broadcast a message to all clients (e.g. reboot server or repair work) so that the clients would know what is going on before the admin reboots the server.