If a program "feels" that his User is calling him, he will go to the I/O Tower to communicate. The program asks for the Guardian's permission to pass and the Guardian, if he allows it, will say a prayer.
After the prayer, the program walks to the inside of the tower and reaches for his Identity Disc. With his arms extended, he releases the disk and the disk floats to the top of the tower and soon flies off into the sky of the computer world, where communication with the User begins.
The tower is not only for communicating with users but also allows users to imprint a code onto their respective program's Identity Disk. For example, Alan Bradley gives Tron the code needed to destroy MCP.
- "All that is visible must grow beyond itself, and extend into the realm of the invisible."