🇺🇦 haxadecimal 🚫👑 on Nostr: I hadn't heard of dmsetup messaging before, and even after reading about it, don't ...

I hadn't heard of dmsetup messaging before, and even after reading about it, don't feel like I understand the concept. What's the point of "sending a message" to a target? Is it something asynchronous? How does the target receive messages? Does it send back a reply? I'm just used to issuing commands directly.