multiprocessing article on PYMOTW - subclassing with 'def run' and 'logging'

[Veek M]

https://pymotw.com/2/multiprocessing/basics.html
https://pymotw.com/2/threading/

I didn't follow this

1.
>The logger can also be configured through the logging configuration file 
>API, using the name multiprocessing.

and 

2.
>it is also possible to use a custom subclass.
> import multiprocessing
> class Worker(multiprocessing.Process):
>    def run(self):
>        print 'In %s' % self.name
>        return


therefore, how is 'def run' going to start a process? 'run' may be 
autocalled same as in 'threading' but in threading, the function is the 
Thread.. so you can do your work in def run: and expect it to be suitably 
threaded

whereas here.. does he somehow magically convert a function to a process?