1. Connect to a WWW server using port 13. This port should return the current date and time.
2. Connect to a WWW server using port 19.
3. Connect two computers over a network and set up a chat connection. One of the computers should be the chat server and the other the chat client. Modify it so that the server accepts calls from one or many clients.
4. Modify Program 28.1 so that the transmitted characters are displayed in the top half of the screen and then received in the bottom half of the screen.