This is all the information I ever needed to do this:
http://java.sun.com/j2se/1.5.0/docs/api/java/net/ServerSocket.html
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html

If you need really high performance:
http://java.sun.com/j2se/1.5.0/docs/api/java/nio/channels/package-summary.html

I had to search www.java.sun.com for tutorials and sample code before I
could implement NIO sockets. But 63 connections on a single thread is
sweet...

ServerSocket on the server binds to a specific port, say 2048 for example.

Each client will attempt to connect to "server:2048"; they all connect to the
same host port.

The server may spawn threads, one per client, to handle individual connections
for performance's sake.

- Lew