Computers are rarely used alone. Nearly every computer talks to other computers, as part of a network. You've probably already heard of the largest network in the world: the Internet! The Internet connects billions (yes, billions) of computers all around the world. In this level, you will learn about computer networks and how to program computers to communicate. You will also learn a bit about computer security (including cryptography) to limit who can access a computer or send and receive messages.

• Section 1: An overview of computer networks
• Section 2: Using networks in ComputerCraft
• Section 3: Programming using rednet
• Section 4: Using networks for fun and profit
• Section 5: A simple password program