AYC, ACD, VCD whats the diffrence?!

[CrownVictorioso]

I know that AYC and ACD are used in 4W vehicles such as the Evo and WRX, and the VCD is a form of traction control. How do they work, and what exactly makes them diffrent?

[GRiDRaceTech]

AYC= Active Yaw Control
ACD= Active Center Differential
VCD= Viscous Center Differential

That's what they are. What they do is up to you to find out.