Do you have a secret code for myepets

Well it depends, if you're referring to the "True Purpose" behind the sharingan, it's that the magenkyou sharingan (the type that needs the user to kill their best friend to obtain) can control the kyuubi. If you're referring to how it works, I'm assuming that chakra moves to the eyes, and is infused in certain parts of the pupil and iris, creating the dots that you see. the actual dots act like secondary eyes, allowing the user to focus on multiple actions at the same time. The red eye effect is probably due to an increase in blood flow in the eyes.