Your devices shouldn't have borders.
One keyboard and mouse across your machines, and the ideas that pass through in a second — 2 small tools, one account, end-to-end encrypted. Once installed they behave as if they had always been on the same machine. More tools are on the way.
Slide the pointer off the edge of one screen and it appears on the next, with keyboard focus following along. The clipboard travels too, and the link switches between LAN-direct and encrypted relay on its own. No extra cable.