Messegas to wireless PCs on the network ?

Is there a way or software can I use to send messages to all wireless
PCs in my network without doing any configurations or installation on
those PC.I've used net send command for that, but is there another way?

any suggestions please.

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This one is easy. NO.

Years ago that was baked into Windows and then an exploit was discovered.

NET SEND is now dead as well as any other method.

This is by design.

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Not possible!

So that means we can not do that ?

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If you ever did, you would be famous for a short while.

Remember I'm using your post as a "spec."

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