Determining the extruder status of a dual-nozzle printer

If I have two nozzles, each with an extruder, how can I determine whether the extruder of one of the two nozzles is activated at the current moment?

"I recommend using Repetier Host. The G1 E command can control the extrusion action of the extruder. Previously, I saw a friend’s studio using dual nozzles to simultaneously produce different parts of a component. The base was made of PETG and the top was made of PLA, which was very successful.

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