he used the toogle quad view
given you can only render only one view , the problem is the following;
you can´t render the other views because quad view is treated as one view
(tested with the preview mode of Blender internal,Cycles)
Blender Internal has a short delay while using Shift + Z. but renders each one.
it boils down to this; there would be for making quad view for Octane to work
a way needed to render a preview right into the image editor of each view
at least for the 3 other views were your mouse is not hovering over.
for now a not so good workflow, you could try this;
create Markers with shortcut M in the timeline
create 4 cameras which are placed like the Quad view ones
Bind each Camera to a Marker with Alt +B
render the 4 image animation.
and then you would need to set Blender up to somehow render them into the image editor of each view.
the renderpreview data is available after closing the Octane server;
open for example 4 Blender instances of the file (to mimic the Quad view)
I started trying it with linked Meshes which is the reason why my fourth blend is different
Render a preview -close the Octane server,
start render preview in another open Blend
and so on.