Multixterm creates multiple xterms that can be driven together. At our
site, we use it to [ssh] to all the hosts in a cluster and do
maintenance on all the hosts simultaneously. Particularly useful with
ad hoc or one-of-a-kind maintenance. Also very cool for debugging host
differences. I would've paid for a program like this but here it is
for free!

http://expect.nist.gov/example/multixterm.man.html