When a Nym client is initalised, it generates and stores its own public/private keypair locally. When the client starts, it automatically connects to the Nym network and finds out what Nym infrastructure exists. It then chooses and connects to a specific Gateway node via websocket.
All apps in the Nym network therefore have an address, in the format:
Which in practice, looks something like this:
This is obviously not very user-friendly and the moment, and will be developed on in the coming months.