Where do I find the USB port interfaces?

Which of the elements in the /dev folder are the USB ports? Mine contains to many to post.

I'm sorry, maybe I didn't ask the correct question. I have a library that looks for the USB ports to do communication, Serialio and Java to be specific. I need to use the USB interfaces, which are usually found in /dev correct? And before anyone tells me to go to SerialIO's forums, I'm working on that as well. It seems that the library isn't finding the ports.

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