Initializing the MLAPI is fairly simple. You need a GameObject with the NetworkingManager component added to it. The NetworkingManager class has a static singleton reference to itself making it easy to access from anywhere. The first configuration you have to do is to set the Transport. You can read more about Transports on the “Custom Transports” page.
To initialize the library. You have three options.
This mode runs a Server and a virtual Client connected to its own server. The virtual client has no real network connection to the server, but instead just talk via message queues. This makes the host both a Server and a Client in the same process.
This mode runs a Client that connects to a Server or Host.
This mode runs a Server which other Clients can connect to. It has no own client attached, and thus lack it’s own player object and such. This is the “dedicated server” mode.