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The method to setup the tb3 involves setting up the PC as the master. This allows all topics to be accessed by both the TB3 and the PC.
In terms of what is running on what, the tutorial only has the bringup running on the tb3. The gmapping is run on the PC, but it takes in data through the tb3 bringup launch through the topics of scan and odom.
By cloning the tb3 repository on both the tb3 and your remote PC, you can run any of the launch files from either machine (except bringup which is on the tb3). If you launch on the tb3, it runs on the tb3; if you launch on your PC, it runs on the PC.
Hope this helps!!