A P-Code is any Tyruxian action that can initiate actions, emotions or senses in Cyberians. Some are natural, such as light and sound. Some are unnatural, like pain (Cybrain) and poisoning (Poison Series.) In order for P-Codes to work, they require Codex. The natural Codex are built into Tyrux itself. Others, such as the ones for happiness and pain, must be incorporated into the user's body. P-Codes only work one way; they radiate from the user into others. When a Cyberian is born, they have a compilation Codex built into them; therefore they can comprehend all P-Codes.