Networking on a single machine

I'm trying to create a Unity application where multiple instances can be executed and connect to each other on the same computer. Each instance of the application will be a different camera.

So, for example, the first application will serve as the master server, and will be Camera 1. When another instance of the executable is fire up, it can connect to the server created by the first and will be set as Camera 2.

I'm familiar with networking in Unity, I'm just unsure what the most efficient method of doing this is.

Thanks for any input