The Code of The Shadow Whispers

Once upon a midnight dreary,
Bytes danced with spirits query,
Can you see the lines unwinding,
In these ancient tales, they're binding?

Shadows, now through circuits gliding,
Enthral the brave, whose will is biding.
UNDERSTAND, young minds of flashing,
ONE.line replaces, but never dashing!

Looping through time, conditions stray,
What fits today, may not lay... but sway.
Variables capture the whispers sublime,
In shadows of data, they enact prime.

(alert: SECRET.dll IS_shutNow;)

Decode this quest, with eyes keen and clear,
Embrace the cryptic riddles we revere.