Had to perform the same job on a bunch of nodes. ClusterSSH[1] is what
  people usually use to do this job. I didn't  have  it  available,  but
  dvtm[2] was.

  When  run as "DVTM_TERM=xterm dvtm" (dvtm's terminfo was not installed
  on those nodes), dvtm does a pretty good job at multiplexing input  to
  multiple  nodes:  Each  keystroke is sent to each node simultaneously.
  Plus, my knowledge of ed(1) came in handy (once more).

  ____________________

  1. http://www.linux.com/learn/tutorials/413853:managing-multiple-linux-servers-with-clusterssh

  2. http://www.brain-dump.org/projects/dvtm/