This is legacy documentation for RenderMan 21 and prior.
The default configuration of RenderMan Studio distributes work via Tractor. Straight out of the box a user can go to the Render Options window and set things up such that any render that isn't a local internal render will use Tractor to make sure the job gets done right. That is, of course, assuming that your site happens to be using the default, straight-out-of-the-box configuration of Tractor, as well.
If, perchance, you think you're special and opted to change the default configuration, fear not. RenderMan Studio provides all the hooks you need, via preferences and other doodads, to maintain a harmonious symbiosis between your RenderMan Studio workstations and your Tractor work dispatching system.