Network rendering allows additional GPUs in other computers to be utilized in rendering images. OctaneRender® distributes compiled render data and not scene data, so no file management is required by the user. Conceptually it is similar to working with additional GPUs by allowing the distributed rendering of single images over multiple computers connected through a fast local area network. Network rendering requires a Primary node and one or more Render Nodes on different computers. 


There is a very detailed description of Network Rendering in Otoy's document site.