Render nodes consist of a Backburner Server, adapters, and processing engines. The kinds of jobs a render node can process depend on the adapters and processing/rendering engines installed upon it. Autodesk Visual Effects and Finishing applications, including Smoke for Mac OS X, share the Burn rendering engine and Wire® processing engine. Some Autodesk applications, such as 3ds Max®, have their own rendering engine. Cleaner®, also, provides its own rendering engine. For efficiency, you can group render nodes together in named groups, called server groups. Particular jobs can then be processed by the nodes in a named group only, leaving nodes outside the group free for other uses.