Send only changes or everything?

I am develop my first client-server game. My question is how could the server send the data to the clients?

The clients have a JTextArea (uses to chat) and a JTable (uses to show how many players). Could these componments receive only changes from last update or the everything? ex. a row or a hole tableModel?

Thx.

[334 byte] By [khuongdpa] at [2007-9-28 8:24:47]