This is a package that implements a "BeatBox"---a program that allows you to create a percussion beat. The BeatBox has a chat feature, so this package also contains a server to provide that feature.
This code started from the code in Appendix A of Head First Java, 2nd Edition by Kathy Sierra and Bert Bates, Copyright, O'Reilly, 2005. ISBN: 0596009208. The students in in the course CISC370 at the University of Delaware, Summer 2007, then did some refactoring and added some features, and the result is the program you see now.