Whenever you need to help another user or see what’s going on another terminal you can use watch.

To determine user terminal.

$ who
Brop            pts/0        Nov 17 21:25 (...)
Athu            pts/1        Nov 17 21:25 (...)
Vorturnal       pts/2        Nov 20 16:38 (...)
Operi           pts/3        Nov 21 16:05 (...)
Xisan           pts/4        Nov 21 16:32 (...)
Sadec           pts/5        Nov 21 16:38 (...)

Connect to terminal.

$ sudo watch pts/2

Connect with write access to observed terminal.

$ sudo watch -W pts/2

Exit watch.

<control-G>

Clear screen.

<control-W>

Change attached tty.

<control-X>