Need help to create AFL stretegy code

#1
Dear members,
Please help to create my trading stretegy based AFL.
I need to have a popout window AFL
either
on previous candle (close) Buy/ Sell based condition
or
previously closed candle Up/Down arrow based condition. The popout window must appear only once in entire buy cycle or Sell cycle.

any one condition will be fine.
i.e.
if Buy = xyz condition is met

popout window ( for buy) (non repeatative) appears

if Sell = xyz condition is met

popout window (for sell) (non repeatative) appears.

Thx in advance for your kind help.
 

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