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How does PA9 (USB VBUS Pin) detect connection by devices?

Question asked by cuneo.john on Apr 16, 2014
Latest reply on Apr 17, 2014 by cuneo.john
I understand it is used to detect whether a device is connected or pulled out. But I have no idea how.

So my questions are as follows:
1,How exactly does that pin work?
2,I can use whatever pin that is five tolerant to provide power supply for my devices (my STM32 is working at host mode of course) right? And I can even use 2 or even 3 of them soldered together to provide power, right?