But, what IS possible, (I've seen it before) is to say something when you join, for example this one guy joined my server once, and RIGHT when he connected, he said hi to everyone on the server. It was like:
This One Guy connected
This One Guy: Hi Penguin/Person!
This One Guy: Hi Chrono!
This One Guy: Hi lilboarder32!
All at once right when he joined.
What code did he use?