Implement the version of the addition server that accepts multiple clients, and test this out by connecting a number of clients. These can be on the same machine as the server, on remote machines, or...

Implement the version of the addition server that accepts multiple clients, and test this out by connecting a number of clients. These can be on the same machine as the server, on remote machines, or a combination. Implement the Critical class of self-test question 4 and then write a tester program to demonstrate the problem of aliases.