Thank you for your answer.
I want to record someone else's (e.g. Mr. Smith) PC remotely.
Actually, I found out "websocket" which is a way to record another person's PC after I asked first question.
If I use websocket to record Mr. Smith's PC and his LG monitor.
Can I record the multi-monitor connected to it?
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1) Me : using windows PC
2) Others (e.g. Mr. Smith) : Using windows PC with LG monitor as multi-monitor