Is the XactSequence number in the profiler globally unique?

Hi,

I need to know if the XactSequence number in the profiler can ever be the same for 2 separate transations. It is also used in the ALL_HEADERS section of TDS packets as a transaction identifier.

I cannot find anywhere that suggests if they are globally unique or not, and if my tests are correct i am seeing them repeat roughly every 15 minutes under very heavy traffic.

Thanks for your time.