Happy,
I don't know but I guess they likely do track previous major lows like everybody else. Recently they especially like to hit obvious stops there, shaking out weak hands before reversing sharply in the other direction. This is happening on all timeframes where we constantly witness fast reverse moves born out of false moves. That's because fishing for these stops helps them reduce the VWAP while filling their positions and they will force the public to chase them in the following days, often with big gaps at the open.
I am aware of these lows and I try to evaluate their potential support strengths with the current pivot clusters. These are the ones that really matter.
Billy