S&P 100 - this will trigger the S&P 500 collapse

S&P100 Index is the basket that contains Huge and Large Caps - almost 50% of the US Equity Market.
At first view the area between 816 and 840 is extremely important for this Index. An invalidation of this support will be critical for the S&P100 and also for the entire US Equity Market.
You should keep an eye on this one too.