I believe this question was answered via support, but to keep the googlers up to speed:
You would submit a cmdrange job with a command that looks like:
"C:/Program Files/Autodesk/Maya2009/bin/Render.exe" -s QB_FRAME_START -e QB_FRAME_END -b QB_FRAME_STEP -rd "Z:\Rendering\March_2012\TEST\TEST" -proj "Z:\RBT\Maya_RBT" -renderer "mr" "Z:\Rendering\March_2012\TEST\TEST.ma"
Using a cmdrange job is likely what you want more than cmdline, as the former allows you to specify a frame range in the submission dialog (which would then allow the job to be split over multiple computers), the latter assumes only a single command be run by only one worker, which means the frame range must be hard-coded into the command line & there's no way to distribute the rendering over the multiple machines.
Using cmdrange also allows for chunking, frame ordering, preview frames, frame specific output, etc. etc. etc.
As an aside, the Maya Batchrender submission should handle all/most of this for you, but if that doesn't suit your needs, using cmdrange should do the trick.
If you would prefer to the the single cmdline rendering option, simply replace the QB_FRAME_* with the appropriate frame numbers.
See attached screen shot for example of the cmdrange version.
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