I have a ubuntu machine running a minecraft-server in a terminal for my daughter and her friends. I can ssh in over the lan from my slackware laptop (with X forwarding) and see it with ps:

$ ps -e | grep terminal
6705 ? 00:00:00 gnome-terminal

I can't seem to find out how I bring it up on the laptop so I can administer the server. I guess I could ssh in and open a terminal on ubuntu and start the server remotely from the laptop, then I would already have it, but quite often it's already running so I need to grab it.

AFAIk there's no way to move an X program between DISPLAYs. You could connect via VNC. Or start minecraft in screen or tmux in the first place, then you can reattach to it from anywhere.

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You probably want to use screen. It's too late for that process, but any new one you start can be started in screen, giving you the ability to attach and detach from it whenever you want from whatever machine you want.

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Ok, thanks to you both, screen it is then.

If you want to share the actual console display so you can view the open terminal window on it, you can use vnc with x11vnc on the remote machine.

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Thanks, I'll read up on it.

Just to qualify how I solved this using screen to grab a process running on 'Server' from 'Laptop':

Starting on Laptop:
xterm # open your terminal, I use xterm
ssh Server # ssh in to Server from Laptop
screen # start screen
command # issue some command, process starts running
Ctrl-a d # detach screen
exit # break ssh connection to Server
...some time later...
xterm # open your terminal, I use xterm
ssh Server # ssh in to Server from Laptop
screen -ls # list running screen sessions
# producing:
30376.foo.Server # 30376 for example only, could be any number
screen -r 30376.foo.Server # reattach to screen session

Hope this helps someone.