$QMI & $QIV - NASDAQ 100 Pre-Market (PMI) and After Hours (AHI) Indicators ?

Hi! Is anyone familiar these two indexes? How do you use them? What do they do?

$QMI - NASDAQ 100 Pre-Market Indicator (PMI)
$QIV - NASDAQ 100 After Hours Indicator (AHI)

I notice it is only available for the $NDX and not any other indexes.
Thanks.

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