USB serial RX pin

I've read the docs for Yun and found that the RX/TX pins are for the serial communication between the two processors and that there isn't RX/TX pins for the USB serial communication. Is there anyway of making two of the pins RX/TX for the USB serial?

EDIT: Or is there a way to make an interrupt on serial receive from USB? I've managed to this on Uno but not Yun

Thanks!

You can use SoftwareSerial Pins rx/tx can be used, but bridge will stop working

[quote author=Federico Fissore link=topic=191341.msg1414401#msg1414401 date=1380804449] You can use SoftwareSerial Pins rx/tx can be used, but bridge will stop working [/quote]

Doesn't that also mean that USB serial communication won't work?

I need it so I can trigger an interrupt via USB serial, I've tried using software serial but I couldn't get what I wanted, I'm probably doing something wrong there though.