How to share vim session across multiple vim instances?

Question

vim

nvim:latest

Task: Make it possible that one vim session can be opened in two terminals that can be sent to different monitors (for example). The same session is needed, because it gives autocomplete, one command history, open buffers, etc. It is necessary that the actions are not mirrored, as for example if tmux is used. Count in one instance, but in several windows.

What I did:
- I found a pull request with nvim with an attach \ deattch feature that seems to fit my task, but I didn’t understand whether it was completed or not, because I didn’t find an example anywhere
- I looked around a bunch of dotfiles and google links, as soon as I didn’t google .. ..

Please tell me who tried to do something similar!
Ps: I really tried to describe as best as possible, sorry, if I'm so bad in the description, write what to add.