In order to make this work you must do the following. (Yes, I know this can be simplier but I wanted to spell it out...)
1) sudo apt-get install redis-server
2) npm install loadbalancer -g
3) cd first && npm install && cd .. && cd second && npm install && cd ..
4) open 3 terminal windows or split if you are using something like terminator
5) In one terminal $ redis-server , in the other two windows run both server files.
6) Use the redis-cli to send a broadcast to both servers and watch the messages in the developer consoles of both browers.
7) Enjoy!