copy/paste from my comment before (from another thread):
Easy.
Lets assume you have computers ABCDE, BB = Backburner.
on your workstation, set DR render to use BCDE.
then send the file to BB and in BB select use only computer A.
as BB receives the job, it will use A and A will work with BCDE.
I use this method quite a lot and it lets me work on my workstation while others "DRF9BB" (Distributed Render - Renders - Backburner).