I know that java.net.* have tons of classes for Networking.
Any one which classes I should use to let all clients on the computer to comunite each other or maybe see the message was post by the administration?
For example: If an Admin. maybe changed some texts in a specify folder, then the Java updated the file once it's save. And when the client open it up, it show the current messages. I am thinking doing this in Java Applet.