Or one person ssh'ing to the same remote from two or more devices. If I don't feel like sitting in the office (desktop) and grab the laptop and go to the sittin

Or one person ssh'ing to the same remote from two or more devices. If I don't feel like sitting in the office (desktop) and grab the laptop and go to the sitting room or back deck I can continue my session without issue, and then transition back later. I don't want to have to disconnect/detach a session when I do this, I want it to be seamless so both connections (actually three typically, an iPad as well) are running continuously.