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Boxsters with "TC" (the more primitive traction control up through about 2001?) have what is called "ABD" or "Active Brake Differential" and "ASR" or "Anti Slip Regulation"
From the Bentley Manual:
Available as an option through the 2000 model year, ABS/TC 5.3 is
an extension to the basic Porsche ABS system with the added
feature of traction control. The traction control system is made up of
two sub-systems, Automatic Brake Differential (ABD) and Anti Slip
Regulation (ASR).
Automatic Brake Differential (ABD) functions similar to a locking or
limited slip differential to help the vehicle retain traction. Uslng the
ABS wheel speed sensors to detect wheel spin during acceleration,
the ABS control module will pulse the hydraulic pressure line of the
brake caliper of the spinning wheel to assist the vehicle in gaining
traction.
If ABD intervention is not enough to regain traction, the ABS/TC
system will employ Anti-Slip Regulation (ASR). ASR adjusts fuel
Injector cycles and retards Ignition timing to reduce engine torque.
When the Traction Control system is operational, the indicator lamp
on Instrument panel is illuminated.
The traction control function can be disabled by means of the TC Off
switch located on the center console. If the TC system is
switched off, the TC warning lamps in the instrument panel and the
TC Off switch are illuminated.
NOTE- ABD remains active until vehicle speed reaches 62.5 miles per
hour, even if the TC system is turned off.
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