The computer is mainly powered by the keyboard. On the main screen, you can open 6 different programs by double clicking a pixel or using the toggle button on the keyboard and then pressing any key. Once in a program, you have multiple keyboard options. Each program is 40-70 events, and do a number of things.
Here's all of the BlockBook's Programs:
Help: Displays 7 help topics (each program has a small help topic as well).
RelayFire: Can find direction and fire relays in four different directions.
BlockTunes: Plays / stops all the default blockland music.
ItemStash: Spawns Tools, Weapons, and some junk.
Preferences: Changes the color or sets a light for the computer.
MediCit: Heals, changes scale, and swaps the datablock of the player.
Edit: The screen also has some functions while in a program.
• Top left pixel: Quits a program
• Top right pixel: (shows the program's color)
• Center pixels: Tells what program you're in
• Bottom left pixel: Toggles options
• Bottom right pixel: Shows options