A method is disclosed for implementing a modified form of User Datagram Protocol (UDP) multicast notification system in a client-server architecture that otherwise allows only client initiated messages. The method including: sending a registration message to a server from a client with a client IP address in the registration message, wherein the registration message includes types of notifications desired to be received by the client; adding the client IP address to a list in a registration message database; requesting a port number from the server by the client; and responding with the port number on which the client should listen by the server.