  We present dw2, a flexible and easy-to-use software infrastructure for
interactive rendering of large tiled display walls. Our library represents the
tiled display wall as a single virtual screen through a display "service",
which renderers connect to and send image tiles to be displayed, either from an
on-site or remote cluster. The display service can be easily configured to
support a range of typical network and display hardware configurations; the
client library provides a straightforward interface for easy integration into
existing renderers. We evaluate the performance of our display wall service in
different configurations using a CPU and GPU ray tracer, in both on-site and
remote rendering scenarios using multiple display walls
