I'm building a java stand alone application. This application is installed on one pc. There is another java stand alone program that it is installed in another pc to another net.
Now I want to send a notification with these program. For example the program 1, send message "start update", and the program 2 read this message and can execute an activity.
Now how can I implemented this push notification. I have also a php server, I don't know if this server is necessary.