[usb] Why is the PC always the host???

[omaud@etud.insa-tlse.fr]

I already asked a question last week and I need to know something else:

It may be a stupid question: I am wondering why the PC is always the host in USB. Is it due to the host-controller (is it 
possible
to define host-controller as a device?) or is it due to the OS (windows). In other words, is it possible to modify the
host-controller in order to see the PC as a device?

Thanks for any informations,
Olivier MAUD 
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