Torque Lock?

I have absolutely no idea what this is.... in a spec sheet of some cars i was looking at, there was a "torquelock, yes or no" line, and many of the cars had torque lock. is this another way of saying limited slip or posi-traction? please, can anybody tell me what it is? thanks, it is very much appreciated.
-Pete

Dana Corp. makes a 4-pinion locking differential called "Torque-Lock" or "Torque-Lok".

Chevy has used it in a couple of concept Camaros, like the ZL1 Concept Camaro.

http://www.zlx.com/camaro/zl1.htm

well this was on a regular v6 mustang from about 98... its not like fancy or anything.