cssh (cluster ssh) enables one to operate multiple ssh simultaneously.

One package:

% sudo pacman -S clusterssh

3 lines of configuration in ~/.csshrc (the hostnames are specified in ~/.ssh/config):

clusters = exp lab
exp = exp01 exp02 exp03 exp04 exp05 exp06 exp07 exp08 exp09 exp10
lab = exp itigo

And I got this with cssh lab command:

(full image)

The input in left-top window is duplicated and sent to all other terminals.