As Hunter rightly says, the stability controls on the 159 are a multi-tiered system
ASR - Anti-Slip Regulation - is what most people call Traction Control. Its job is to limit wheelspin. It does this in two separate circumstances.
1. If both wheels are spinning, ASR reduces engine power to prevent wheelspin
2. If only one wheel is spinning, ASR applies braking force to the spinning wheel to transfer power to the gripping wheel.
VDC - Vehicle Dynamics Control is a complex system which employs braking to individual wheels to prevent or limit skidding on turns, excessive yaw etc. This also incorporates Hill Holder.
Since MY2008, the 159 stability system was upgraded to provide "Q2e electronic differential", which like ASR, transfers power on corners to the wheel with the most grip by applying a braking force to the spinning wheel. Although only giving 50% of the effect of a mechanical differential it certainly seems to work in practice.
One final tip - If you decide to try Hunter's test by turning off the electronics, please make sure I am not coming the other way at the time