# File lib/net/ssh/multi/session_actions.rb, line 80
    def open_channel(type="session", *extra, &on_confirm)
      channels = sessions.map do |ssh|
        ssh.open_channel(type, *extra) do |c|
          c[:server] = c.connection[:server]
          c[:host] = c.connection[:server].host
          on_confirm[c] if on_confirm
        end
      end
      Multi::Channel.new(master, channels)
    end