Host is the root Node of the ADN device tree. for example, it can be a PC, an HMD or a VR backpack.
Host is a part of the ADN that unites all the connected devices in one system. It processes data received from the access point via USB. In turn, the access point receives data from the connected clients. Please, read here to learn more about the exchange of data between access points and clients: Antilatency Radio Protocol