You need:

3 accounts
2 keyclone licenses

Open keyclone on both machines. On your main machine enter the commands for your first two accounts (if you haven't done this or don't know how to read some FAQs and watch some videos) and the IP of your second machine. On the second machine enter the command name of your third account. It might look like this;

account1;account2;192.168.0.3 <--- main machine
account3 <--- machine 2

This is how I do it. When you click connect on keyclones your WoWs will all load up and you will be broadcasting keys over all three copies of WoW.