How and where to use the keywords "FIND STOCKS WHERE"

In the Tradescript Help Manual there is a use of the keywords

"FIND STOCKS WHERE"

for eg: in page 81

Parabolic SAR / MA Script
Buy Signals
# Buy if the MAs crossed today or yesterday and
# if the PSAR crossed today or yesterday
FIND STOCKS WHERE
(CROSSOVER(CLOSE, PSAR(0.02, 0.2)) OR
CROSSOVER(REF(CLOSE,1), PSAR(0.02, 0.2)))
AND
(CROSSOVER(EMA(CLOSE, 10), EMA(CLOSE, 20)) OR
CROSSOVER(REF(EMA(CLOSE, 10),1), REF(EMA(CLOSE, 20),1)))

My Question is, if the EAs are specifically meant for running on individual securities / charts, then what is the use of using those keywords (Find stocks where).

is it something that we can use in the scanner code?

Please elaborate on your answers, on why, where and how to use these keywords.

That is not possible in current pi version.

Ok. Thanks for your response. Just for my clarity. what is the intention behind these key words? meaning, how is it foreseen to be used in future?

It could be used to scan multiple stocks at the same time and find the best stock to trade.