Hook up into another Terminal process?

I've got two terminal instances/processes opened with different PID.

Is it possible to from one of them, hook up into the other so when I type something and it outputs something, then the other terminal will see the output too (maybe the input too if possible?).

Just like cloning the terminals.

I want this because then I can hook up some SSH processes and everyone connected to the machine could see what the other one is doing and could also collaborate.

I don't want to use any GUI or other workarounds for this.

Want it t开发者_如何学Pythono be in process level.

I'm using Ruby and Ubuntu.

---

Install GNU Screen, run screen in the first terminal, then screen -x in the second.

(This works for both input and output).

---

Go hack the kernel.

But if you need a practical workarou^Wsolution, I'd advise using screen.