I'm a bit out of touch now-a-days, but from memory ASC+T used to reduce the
ignition timing, throttle (via a separate throttle butterfly)  and brake the
individual wheel(s) that was spinning.

From memory, DSC also used to monitor YAW and would try to straighten the
vehicle by applying the brakes to the relevant wheels during acceleration to
straighten it.  When actually driving it, it could catch you out because if
you are expecting a bit of oversteer, as you go to compensate, the DSC also
compensates at the same time.  Also had EBD, which would try to straighten
the vehicle during braking, although may have been on ASC+T systems as well,
can't remember.

For me, I prefer a LSD everytime.  Maybe not as good in the snow and ice,
but you know exactly what the vehicle is doing during normal driving.  You
can switch them off by holding the button down for 5 seconds, but then you
have a conventional diff (except on the M-Powers).  Just pressing the button
quickly, doesn't totally disengage it, it will still apply the brakes.